# Problems dealing with Confidence Interval Estimation and Hypothesis Testing

Anonymous
account_balance_wallet \$9.99

### Question Description

 There are actually 9 problems broken down to individual components to identify key steps required to solve the problem. They appear as multiple chioce questions. For example the 1st 8 questions are dealing with one problem.
1. The labor relations manager of a large corporation wished to study the absenteeism among workers at the company's central office during the last year. A random sample of 25 workers revealed the following: an average of 9.7 days; a standard deviation of 4.0 days; and 12 employees were absent more than 10 days. In estimating a 95% confidence interval estimate of the average number of days absent for the company's workers last year what will be the standard error?
 4 0.16 0.8 0.025

1.8 points

### QUESTION 2

1. The labor relations manager of a large corporation wished to study the absenteeism among workers at the company's central office during the last year. a random sample of 25 workers revealed the following: an average of 9.7 days; a standard deviation of 4.0 days; and 12 employees were absent more than 10 days. In estimating a 95% confidence interval estimate of the average number of days absent for the company's workers last year should you use a z or t value in the formula?
 z t

1.8 points

### QUESTION 3

1. The labor relations manager of a large corporation wished to study the absenteeism among workers at the company's central office during the last year. a random sample of 25 workers revealed the following: an average of 9.7 days; a standard deviation of 4.0 days; and 12 employees were absent more than 10 days. In estimating a 95% confidence interval estimate of the average number of days absent for the company's workers last year what would be the value of your UPPER limit?
 17.96 10.03 11.35 8.049

1.8 points

### QUESTION 4

1. The labor relations manager of a large corporation wished to study the absenteeism among workers at the company's central office during the last year. a random sample of 25 workers revealed the following: an average of 9.7 days; a standard deviation of 4.0 days; and 12 employees were absent more than 10 days. In estimating the 95% confidence interval estimate of the proportion of workers absent more than 10 days last year what is the sample proportion used in the formula?
 0.12 0.1 0.48 40

1.9 points

### QUESTION 5

1. The labor relations manager of a large corporation wished to study the absenteeism among workers at the company's central office during the last year. a random sample of 25 workers revealed the following: an average of 9.7 days; a standard deviation of 4.0 days; and 12 employees were absent more than 10 days. In estimating the 95% confidence interval estimate of the proportion of workers absent more than 10 days last year would you use a z or t in the formula?
 z t

1.9 points

### QUESTION 6

1. The labor relations manager of a large corporation wished to study the absenteeism among workers at the company's central office during the last year. a random sample of 25 workers revealed the following: an average of 9.7 days; a standard deviation of 4.0 days; and 12 employees were absent more than 10 days. In estimating the 95% confidence interval estimate of the proportion of workers absent more than 10 days last year what is the value of the Z used in the formula?
 1.708 1.711 1.65 1.96

1.9 points

### QUESTION 7

1. The labor relations manager of a large corporation wished to study the absenteeism among workers at the company's central office during the last year. a random sample of 25 workers revealed the following: an average of 9.7 days; a standard deviation of 4.0 days; and 12 employees were absent more than 10 days. In estimating the 95% confidence interval estimate of the proportion of workers absent more than 10 days last year what is the upper limit of the confidence interval?
 0.516 0.6445 0.284 0.676

1.9 points

### QUESTION 8

1. You are considering investing in a company. The company claims for the past few years the average monthly return on such an investment has been \$870 with a standard deviation of \$50. You sample 30 investors and determine the sample average return to be \$855. Using a .05 level of significance you will test to determine if there is evidence that the true average return is different from \$870. Is this a 1 or 2 tail test?
 1 tail 2 tail indeterminate none of the above

1 points

### QUESTION 9

1. You are considering investing in a company. The company claims for the past few years the average monthly return on such an investment has been \$870 with a standard deviation of \$50. You sample 30 investors and determine the sample average return to be \$855. Using a .05 level of significance you will test to determine if there is evidence that the true average return is different from \$870. What are your critical values?
 +- 1.65 +- 2.045 +-1.96 +-1.65

1.8 points

### QUESTION 10

1. You are considering investing in a company. The company claims for the past few years the average monthly return on such an investment has been \$870 with a standard deviation of \$50. You sample 30 investors and determine the sample average return to be \$855. Using a .05 level of significance you will test to determine if there is evidence that the true average return is different from \$870. What is the value of your test statistic?
 0.3 -0.3 8.98 -1.64

1.9 points

### QUESTION 11

1. You are considering investing in a company. The company claims for the past few years the average monthly return on such an investment has been \$870 with a standard deviation of \$50. You sample 30 investors and determine the sample average return to be \$855. Using a .05 level of significance you will test to determine if there is evidence that the true average return is different from \$870. If your test statistic is -1.64 what will be your decision?
 Reject Ho Reject H1 Do not reject H1 Do not reject Ho

1.9 points

### QUESTION 12

1. You are considering investing in a company. The company claims for the past few years the average monthly return on such an investment has been \$870 with a standard deviation of \$50. You sample 30 investors and determine the sample average return to be \$855. Using a .05 level of significance you will test to determine if there is evidence that the true average return is different from \$870. What is your conclusion?
 There is evidence of a difference in the average return. There is no evidecne of a difference in the average return Indeterminate Inconclusive

1.9 points

### QUESTION 13

1. A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years. A random sample of 600 young adults not enrolled in college was selected and 150 of them had at least one motor vehicle accident in the previous two years. At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. Is this a 1 or 2 tail test?
 1 tail 2 tail

1.9 points

### QUESTION 14

1. A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years. A random sample of 600 young adults not enrolled in college was selected and 150 of them had at least one motor vehicle accident in the previous two years. At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. Is this a one sample or two sample test?
 one sample two sample

1.9 points

### QUESTION 15

1. A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years. A random sample of 600 young adults not enrolled in college was selected and 150 of them had at least one motor vehicle accident in the previous two years. At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. Is this a test of sample means or sample proportions?
 sample proportions sample means both neither

1 points

### QUESTION 16

1. A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years. A random sample of 600 young adults not enrolled in college was selected and 150 of them had at least one motor vehicle accident in the previous two years. At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. What are your critical values?
 +- 1.65 +-1.96 1.74 1.79

1.9 points

### QUESTION 17

1. A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years. A random sample of 600 young adults not enrolled in college was selected and 150 of them had at least one motor vehicle accident in the previous two years. At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. What is the value of your pooled proportion?
 0.27 0.73 0.55 0.05

1.9 points

### QUESTION 18

1. A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years. A random sample of 600 young adults not enrolled in college was selected and 150 of them had at least one motor vehicle accident in the previous two years. At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. What is the value of your test statistic?
 1.96 1.65 1.74 0.05

1.9 points

### QUESTION 19

1. A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years. A random sample of 600 young adults not enrolled in college was selected and 150 of them had at least one motor vehicle accident in the previous two years. At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. What is your decision?
 Reject Ho Reject H1 Do not reject Ho none of the above

1.9 points

### QUESTION 20

1. A random sample of 400 college students was selected and 120 of them had at least one motor vehicle accident in the previous two years. A random sample of 600 young adults not enrolled in college was selected and 150 of them had at least one motor vehicle accident in the previous two years. At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. If you determine not to reject the null hypothesis what is your conclusion?
 There is evidence of a difference in the proportions of college aged students and non college aged students having accidents There is no evidence of a difference in the proportions of college aged students and non college aged students having accidents the data is inconclusive none of the above

1.9 points

### QUESTION 21

1. A statewide real estate company specializes in selling farm property in the state of Nebraska. Their records indicate that the mean selling time of farm property is 90 days. Because of recent drought conditions, they believe that the mean selling time is now greater than 90 days. A statewide survey of 100 farms sold recently revealed that the mean selling time was 94 days, with a standard deviation of 22 days. At the .10 significance level you will test to determine if there has been an increase in selling time. Is this a 1 or 2 tail test?
 1 tail 2 tail

1.9 points

### QUESTION 22

1. A statewide real estate company specializes in selling farm property in the state of Nebraska. Their records indicate that the mean selling time of farm property is 90 days. Because of recent drought conditions, they believe that the mean selling time is now greater than 90 days. A statewide survey of 100 farms sold recently revealed that the mean selling time was 94 days, with a standard deviation of 22 days. At the .10 significance level you will test to determine if there has been an increase in selling time. What is the H1?
 H1: U< 90 H1 not equal to 90 H1: U>90 Ho: U > or equal to 90

1.9 points

### QUESTION 23

1. A statewide real estate company specializes in selling farm property in the state of Nebraska. Their records indicate that the mean selling time of farm property is 90 days. Because of recent drought conditions, they believe that the mean selling time is now greater than 90 days. A statewide survey of 100 farms sold recently revealed that the mean selling time was 94 days, with a standard deviation of 22 days. At the .10 significance level you will test to determine if there has been an increase in selling time. Is this a Z or t test?
 t Z

1.9 points

### QUESTION 24

1. A statewide real estate company specializes in selling farm property in the state of Nebraska. Their records indicate that the mean selling time of farm property is 90 days. Because of recent drought conditions, they believe that the mean selling time is now greater than 90 days. A statewide survey of 100 farms sold recently revealed that the mean selling time was 94 days, with a standard deviation of 22 days. At the .10 significance level you will test to determine if there has been an increase in selling time. Assuming we are using a t test what will be the critical value"?
 1.28 -1.28 1.29 -1.29

1.9 points

### QUESTION 25

1. A statewide real estate company specializes in selling farm property in the state of Nebraska. Their records indicate that the mean selling time of farm property is 90 days. Because of recent drought conditions, they believe that the mean selling time is now greater than 90 days. A statewide survey of 100 farms sold recently revealed that the mean selling time was 94 days, with a standard deviation of 22 days. At the .10 significance level you will test to determine if there has been an increase in selling time. What is the value of your test statistic?
 1.28 1.79 1.82 -1.82

1.9 points

### QUESTION 26

1. A statewide real estate company specializes in selling farm property in the state of Nebraska. Their records indicate that the mean selling time of farm property is 90 days. Because of recent drought conditions, they believe that the mean selling time is now greater than 90 days. A statewide survey of 100 farms sold recently revealed that the mean selling time was 94 days, with a standard deviation of 22 days. At the .10 significance level you will test to determine if there has been an increase in selling time. What is your decision?
 reject Ho do not reject Ho reject H1 none of the above

1.9 points

### QUESTION 27

1. A statewide real estate company specializes in selling farm property in the state of Nebraska. Their records indicate that the mean selling time of farm property is 90 days. Because of recent drought conditions, they believe that the mean selling time is now greater than 90 days. A statewide survey of 100 farms sold recently revealed that the mean selling time was 94 days, with a standard deviation of 22 days. At the .10 significance level you will test to determine if there has been an increase in selling time. What is your conclusion?
 there is no evidence that there has been an increase in the average selling time there is evidence that there has been an increase in the average selling time there is no evidence that there has been a decrease in the average selling time there is evidence that there has been a decrease increase in the average selling time

1.9 points

### QUESTION 28

1. The policy of the Suburban Transit authority is to add a bus route if more than 55 percent of the potential commuters indicate they would use the particular route. A sample of 70 commuters revealed that 42 would use a proposed route from Bowman Park to the downtown area. You will be testing to determine if the Bowman-to-downtown route meets the STA criterion using the .05 significance level. Is this a one or two tail test?
 1 tail 2 tail both neither

1.9 points

### QUESTION 29

1. The policy of the Suburban Transit authority is to add a bus route if more than 55 percent of the potential commuters indicate they would use the particular route. A sample of 70 commuters revealed that 42 would use a proposed route from Bowman Park to the downtown area. You will be testing to determine if the Bowman-to-downtown route meets the STA criterion using the .05 significance level. Is this a Z, t, or F test?
 Z t F

1.9 points

### QUESTION 30

1. The policy of the Suburban Transit authority is to add a bus route if more than 55 percent of the potential commuters indicate they would use the particular route. A sample of 70 commuters revealed that 42 would use a proposed route from Bowman Park to the downtown area. You will be testing to determine if the Bowman-to-downtown route meets the STA criterion using the .05 significance level. What is the alternate hypothesis?
 Ho: proportion > .55 H1: proportion > .55 H1: proportion < .55 H1: proportion > .60

1.9 points

### QUESTION 31

1. The policy of the Suburban Transit authority is to add a bus route if more than 55 percent of the potential commuters indicate they would use the particular route. A sample of 70 commuters revealed that 42 would use a proposed route from Bowman Park to the downtown area. You will be testing to determine if the Bowman-to-downtown route meets the STA criterion using the .05 significance level. What is the value of your critical value?
 1.96 -1.96 1.645 -1.645

1.9 points

### QUESTION 32

1. The policy of the Suburban Transit authority is to add a bus route if more than 55 percent of the potential commuters indicate they would use the particular route. A sample of 70 commuters revealed that 42 would use a proposed route from Bowman Park to the downtown area. You will be testing to determine if the Bowman-to-downtown route meets the STA criterion using the .05 significance level. What is the value of your test statistic?
 0.6 0.85 0.05 0.55

1.9 points

### QUESTION 33

1. The policy of the Suburban Transit authority is to add a bus route if more than 55 percent of the potential commuters indicate they would use the particular route. A sample of 70 commuters revealed that 42 would use a proposed route from Bowman Park to the downtown area. You will be testing to determine if the Bowman-to-downtown route meets the STA criterion using the .05 significance level. What is your decision?
 reject H1 do not reject Ho reject Ho indeterminate

1.9 points

### QUESTION 34

1. The policy of the Suburban Transit authority is to add a bus route if more than 55 percent of the potential commuters indicate they would use the particular route. A sample of 70 commuters revealed that 42 would use a proposed route from Bowman Park to the downtown area. You will be testing to determine if the Bowman-to-downtown route meets the STA criterion using the .05 significance level. What is your conclusion?
 There is evidence that more than 55% would use the route and therefore the STA criteria is met. There is no evidence that more than 55% would use the route and therefore the STA criteria was not met. .60 is greater than .55 so the criteria is met indeterminant

1.9 points

### QUESTION 35

1. An industrial engineer would like to determine whether there are more units produced on the afternoon shift than on the morning shift. A sample of 50 morning-shift workers showed that the mean number of units produced was 345, with a standard deviation of 21. A sample of 60 afternoon-shift workers showed the mean number of units produced was 351, with a standard deviation of 28 units. At the .05 significance level we will test if the mean number of units produced on the afternoon-shift is larger. Is this a one sample test or a two sample test?
 one sample test two sample test neither both

1.9 points

### QUESTION 36

1. An industrial engineer would like to determine whether there are more units produced on the afternoon shift than on the morning shift. A sample of 50 morning-shift workers showed that the mean number of units produced was 345, with a standard deviation of 21. A sample of 60 afternoon-shift workers showed the mean number of units produced was 351, with a standard deviation of 28 units. At the .05 significance level we will test if the mean number of units produced on the afternoon-shift is larger. Is this a one tail or two tail test?
 neither one tail two tail

1.5 points

### QUESTION 37

1. An industrial engineer would like to determine whether there are more units produced on the afternoon shift than on the morning shift. A sample of 50 morning-shift workers showed that the mean number of units produced was 345, with a standard deviation of 21. A sample of 60 afternoon-shift workers showed the mean number of units produced was 351, with a standard deviation of 28 units. At the .05 significance level we will test if the mean number of units produced on the afternoon-shift is larger. What is H1?
 Ua < Um where "m" is morning and "a" is afternoon Um > Ua Ua > Um Ua not equal to Um

1.9 points

### QUESTION 38

1. An industrial engineer would like to determine whether there are more units produced on the afternoon shift than on the morning shift. A sample of 50 morning-shift workers showed that the mean number of units produced was 345, with a standard deviation of 21. A sample of 60 afternoon-shift workers showed the mean number of units produced was 351, with a standard deviation of 28 units. At the .05 significance level we will test if the mean number of units produced on the afternoon-shift is larger. What is your critical value?
 1.96 1.28 1.645 0.05

1.9 points

### QUESTION 39

1. An industrial engineer would like to determine whether there are more units produced on the afternoon shift than on the morning shift. A sample of 50 morning-shift workers showed that the mean number of units produced was 345, with a standard deviation of 21. A sample of 60 afternoon-shift workers showed the mean number of units produced was 351, with a standard deviation of 28 units. At the .05 significance level we will test if the mean number of units produced on the afternoon-shift is larger. What is your test statistic?
 1.645 1.28 0.05 6

1.9 points

### QUESTION 40

1. An industrial engineer would like to determine whether there are more units produced on the afternoon shift than on the morning shift. A sample of 50 morning-shift workers showed that the mean number of units produced was 345, with a standard deviation of 21. A sample of 60 afternoon-shift workers showed the mean number of units produced was 351, with a standard deviation of 28 units. At the .05 significance level we will test if the mean number of units produced on the afternoon-shift is larger. If your critical value is on the right of your curve and your test statistic is less than the critical value what will be your decision?
 reject H1 do not reject Ho reject Ho it depends

1.9 points

### QUESTION 41

1. An industrial engineer would like to determine whether there are more units produced on the afternoon shift than on the morning shift. A sample of 50 morning-shift workers showed that the mean number of units produced was 345, with a standard deviation of 21. A sample of 60 afternoon-shift workers showed the mean number of units produced was 351, with a standard deviation of 28 units. At the .05 significance level we will test if the mean number of units produced on the afternoon-shift is larger. What is your conclusion?
 There is evidence that the mean number of units produced by the afternoon shift is larger. There is evidence that the mean number of units produced by the morning shift is larger. There is no evidence that the mean number of units produced by the afternoon shift is larger. There is evidence that the mean number of units produced by the morning shift is smaller.

1.9 points

### QUESTION 42

1. The manager of a package courier service believes that packages shipped at the end of the month are heavier than those shipped early in the month. As an experiment, he weighed a random sample of 20 packages at the beginning of the month. He found that the mean weight was 20.25 pounds and the standard deviation was 5.84 pounds. Ten packages randomly selected at the end of the month had a mean weight of 24.80 pounds and a standard deviation of 5.67 pounds. At the .05 significance level, we will test to see if we can we conclude that the packages shipped at the end of the month weigh more. What is the alternate hypothesis
 Ue < Ub where e =end of month and b=begining of month Ue > Ub Ub > Ue Ub = Ue

1.9 points

### QUESTION 43

1. The manager of a package courier service believes that packages shipped at the end of the month are heavier than those shipped early in the month. As an experiment, he weighed a random sample of 20 packages at the beginning of the month. He found that the mean weight was 20.25 pounds and the standard deviation was 5.84 pounds. Ten packages randomly selected at the end of the month had a mean weight of 24.80 pounds and a standard deviation of 5.67 pounds. At the .05 significance level, we will test to see if we can we conclude that the packages shipped at the end of the month weigh more. What is your critical value?
 1.701 0.5 1.645 1.96

1.9 points

### QUESTION 44

1. The manager of a package courier service believes that packages shipped at the end of the month are heavier than those shipped early in the month. As an experiment, he weighed a random sample of 20 packages at the beginning of the month. He found that the mean weight was 20.25 pounds and the standard deviation was 5.84 pounds. Ten packages randomly selected at the end of the month had a mean weight of 24.80 pounds and a standard deviation of 5.67 pounds. At the .05 significance level, we will test to see if we can we conclude that the packages shipped at the end of the month weigh more. What is the value of your test statistic?
 -2.03 11.75 2.03 -11.05

1.9 points

### QUESTION 45

1. The manager of a package courier service believes that packages shipped at the end of the month are heavier than those shipped early in the month. As an experiment, he weighed a random sample of 20 packages at the beginning of the month. He found that the mean weight was 20.25 pounds and the standard deviation was 5.84 pounds. Ten packages randomly selected at the end of the month had a mean weight of 24.80 pounds and a standard deviation of 5.67 pounds. At the .05 significance level, we will test to see if we can we conclude that the packages shipped at the end of the month weigh more. What is your decision?
 reject Ho do not reject Ho indeterminate reject H1

1.9 points

### QUESTION 46

1. The manager of a package courier service believes that packages shipped at the end of the month are heavier than those shipped early in the month. As an experiment, he weighed a random sample of 20 packages at the beginning of the month. He found that the mean weight was 20.25 pounds and the standard deviation was 5.84 pounds. Ten packages randomly selected at the end of the month had a mean weight of 24.80 pounds and a standard deviation of 5.67 pounds. At the .05 significance level, we will test to see if we can we conclude that the packages shipped at the end of the month weigh more. What is your conclusion?
 There is no evidence of a difference in the mean weight there is no evidence that the packages shipped at the end of the month weigh more there is evidence that the packages shipped at the end of the month weigh more there is evidence that the packages shipped at the end of the month weigh less

1.9 points

### QUESTION 47

1. A statistics professor would like to determine whether students in the class showed improved performance on the final exam as compared to the midterm examination. A random sample of 7 students selected from a large class revealed the following scores: midterm 70, 62, 57, 68, 89, 63, 82 and on the final 80, 79, 87, 88, 85, 79, 91. We will test to determine if there evidence of an improvement on the final examination, at the 1% significance level. What is the alternate hypothesis?
 Uf does not equal Um, where f=final and m=midterm Uf < Um Um > Uf Uf > Um

1.9 points

### QUESTION 48

1. A statistics professor would like to determine whether students in the class showed improved performance on the final exam as compared to the midterm examination. A random sample of 7 students selected from a large class revealed the following scores: midterm 70, 62, 57, 68, 89, 63, 82 and on the final 80, 79, 87, 88, 85, 79, 91. We will test to determine if there evidence of an improvement on the final examination, at the 1% significance level. What is the critical value?
 1.96 3.5 2.28 3.1427

1.9 points

### QUESTION 49

1. A statistics professor would like to determine whether students in the class showed improved performance on the final exam as compared to the midterm examination. A random sample of 7 students selected from a large class revealed the following scores: midterm 70, 62, 57, 68, 89, 63, 82 and on the final 80, 79, 87, 88, 85, 79, 91. We will test to determine if there evidence of an improvement on the final examination, at the 1% significance level. What is your test statistic?
 10.57 9.27 3.504 1.96

1.9 points

### QUESTION 50

1. A statistics professor would like to determine whether students in the class showed improved performance on the final exam as compared to the midterm examination. A random sample of 7 students selected from a large class revealed the following scores: midterm 70, 62, 57, 68, 89, 63, 82 and on the final 80, 79, 87, 88, 85, 79, 91. We will test to determine if there evidence of an improvement on the final examination, at the 1% significance level. What is your decision?
 do not reject Ho reject Ho reject H1 inconclusive

1.9 points

### QUESTION 51

1. A statistics professor would like to determine whether students in the class showed improved performance on the final exam as compared to the midterm examination. A random sample of 7 students selected from a large class revealed the following scores: midterm 70, 62, 57, 68, 89, 63, 82 and on the final 80, 79, 87, 88, 85, 79, 91. We will test to determine if there evidence of an improvement on the final examination, at the 1% significance level. What is your conclusion?
 There is no difference between the scores there is no evidence of a significant improvement on the final there is evidence of a significant improvement on the final students scored better on the midterm

1.9 points

### QUESTION 52

1. There are two car dealerships in a particular area. The mean monthly sales at the two dealerships are about the same. However, one of the dealerships (dealership A) is boasting to corporate headquarters that his dealership’s monthly sales are more consistent. An industry analyst reviews the last seven months at dealership A and finds the standard deviation of the seven monthly sales to be 14.79. He reviews the last eight months at dealership B and finds the standard deviation of the eight monthly sales to be 22.95. Using the .01 significance level you will test to conclude if the analyst finds evidence that the boast of dealership A is correct. What will be your critical value?
 1 1.55 2 1.35 3 2.41 4 8.26

1.9 points

### QUESTION 53

1. There are two car dealerships in a particular area. The mean monthly sales at the two dealerships are about the same. However, one of the dealerships (dealership A) is boasting to corporate headquarters that his dealership’s monthly sales are more consistent. An industry analyst reviews the last seven months at dealership A and finds the standard deviation of the seven monthly sales to be 14.79. He reviews the last eight months at dealership B and finds the standard deviation of the eight monthly sales to be 22.95. Using the .01 significance level you will test to see if the analyst finds evidence that the boast of dealership A is correct. What is the value of the test statistic?
 2.41 8.26 1.55 1.96

1.9 points

### QUESTION 54

1. There are two car dealerships in a particular area. The mean monthly sales at the two dealerships are about the same. However, one of the dealerships (dealership A) is boasting to corporate headquarters that his dealership’s monthly sales are more consistent. An industry analyst reviews the last seven months at dealership A and finds the standard deviation of the seven monthly sales to be 14.79. He reviews the last eight months at dealership B and finds the standard deviation of the eight monthly sales to be 22.95. Using the .01 significance level does the analyst find evidence that the boast of dealership A is correct?
 yes no indeterminant

uoscar
School: Cornell University

The solution is attached.Please, give me feedback.

QUESTION 1

.
The labor relations manager of a large corporation wished to study the absenteeism
among workers at the company's central office during the last year. A random sample
of 25 workers revealed the following: an average of 9.7 days; a standard deviation of
4.0 days; and 12 employees were absent more than 10 days. In estimating a 95%
confidence interval estimate of the average number of days absent for the company's
workers last year what will be the standard error?
.
4.0
.16
.80
.025
.
1.8 points

QUESTION 2

.
The labor relations manager of a large corporation wished to study the absenteeism
among workers at the company's central office during the last year. a random sample
of 25 workers revealed the following: an average of 9.7 days; a standard deviation of
4.0 days; and 12 employees were absent more than 10 days. In estimating a 95%
confidence interval estimate of the average number of days absent for the company's
workers last year should you use a z or t value in the formula?
.
z
t

.

1.8 points

QUESTION 3

.
The labor relations manager of a large corporation wished to study the absenteeism
among workers at the company's central office during the last year. a random sample
of 25 workers revealed the following: an average of 9.7 days; a standard deviation of
4.0 days; and 12 employees were absent more than 10 days. In estimating a 95%
confidence interval estimate of the average number of days absent for the company's
workers last year what would be the value of your UPPER limit?
.
17.96
10.03
11.35
8.049
.
1.8 points

QUESTION 4

.
The labor relations manager of a large corporation wished to study the absenteeism
among workers at the company's central office during the last year. a random sample
of 25 workers revealed the following: an average of 9.7 days; a standard deviation of
4.0 days; and 12 employees were absent more than 10 days. In estimating the 95%
confidence interval estimate of the proportion of workers absent more than 10 days
last year what is the sample proportion used in the formula?
.
.12
.10
.48
040
.
1.9 points

QUESTION 5

.

The labor relations manager of a large corporation wished to study the absenteeism
among workers at the company's central office during the last year. a random sample
of 25 workers revealed the following: an average of 9.7 days; a standard deviation of
4.0 days; and 12 employees were absent more than 10 days. In estimating the 95%
confidence interval estimate of the proportion of workers absent more than 10 days
last year would you use a z or t in the formula?
.
z
t

.
1.9 points

QUESTION 6

.
The labor relations manager of a large corporation wished to study the absenteeism
among workers at the company's central office during the last year. a random sample
of 25 workers revealed the following: an average of 9.7 days; a standard deviation of
4.0 days; and 12 employees were absent more than 10 days. In estimating the 95%
confidence interval estimate of the proportion of workers absent more than 10 days
last year what is the value of the Z used in the formula?
.
1.708
1.711
1.65
1.96

1.9 points

QUESTION 7

The labor relations manager of a large corporation wished to study the absenteeism
among workers at the company's central office during the last year. a random sample
of 25 workers revealed the following: an average of 9.7 days; a standard deviation of
4.0 days; and 12 employees were absent more than 10 days. In estimating the 95%
confidence interval estimate of the proportion of workers absent more than 10 days
last year what is the upper limit of the confidence interval?
.
.516
.6445
.284
.676
.
1.9 points

QUESTION 8

.
You are considering investing in a company. The company claims for the past few
years the average monthly return on such an investment has been \$870 with a
standard deviation of \$50. You sample 30 investors and determine the sample average
return to be \$855. Using a .05 level of significance you will test to determine if there
is evidence that the true average return is different from \$870. Is this a 1 or 2 tail test?
.
1 tail
2 tail
indeterminate
none of the above

1 points

QUESTION 9

.
You are considering investing in a company. The company claims for the past few
years the average monthly return on such an investment has been \$870 with a
standard deviation of \$50. You sample 30 investors and determine the sample average
return to be \$855. Using a .05 level of significance you will test to determine if there
is evidence that the true average return is different from \$870. What are your critical
values?
.
+- 1.65
+- 2.045
+-1.96
+-1.65
.
1.8 points

QUESTION 10

.
You are considering investing in a company. The company claims for the past few
years the average monthly return on such an investment has been \$870 with a
standard deviation of \$50. You sample 30 investors and determine the sample average
return to be \$855. Using a .05 level of significance you will test to determine if there
is evidence that the true average return is different from \$870. What is the value of
.
.30
-.30
8.98
-1.64
.
1.9 points

QUESTION 11

.

You are considering investing in a company. The company claims for the past few
years the average monthly return on such an investment has been \$870 with a
standard deviation of \$50. You sample 30 investors and determine the sample average
return to be \$855. Using a .05 level of significance you will test to determine if there
is evidence that the true average return is different from \$870. If your test statistic is
-1.64 what will be your decision?
.
Reject Ho
Reject H1
Do not reject H1
Do not reject Ho
.
1.9 points

QUESTION 12

.
You are considering investing in a company. The company claims for the past few
years the average monthly return on such an investment has been \$870 with a
standard deviation of \$50. You sample 30 investors and determine the sample average
return to be \$855. Using a .05 level of significance you will test to determine if there
is evidence that the true average return is different from \$870. What is your
conclusion?
.
There is evidence of a difference in the average return.
There is no evidence of a difference in the average return
Indeterminate
Inconclusive

1.9 points

QUESTION 13

A random sample of 400 college students was selected and 120 of them had at least
one motor vehicle accident in the previous two years. A random sample of 600 young
adults not enrolled in college was selected and 150 of them had at least one motor
vehicle accident in the previous two years. At t...

flag Report DMCA
Review

Anonymous
Top quality work from this guy! I'll be back!

Brown University

1271 Tutors

California Institute of Technology

2131 Tutors

Carnegie Mellon University

982 Tutors

Columbia University

1256 Tutors

Dartmouth University

2113 Tutors

Emory University

2279 Tutors

Harvard University

599 Tutors

Massachusetts Institute of Technology

2319 Tutors

New York University

1645 Tutors

Notre Dam University

1911 Tutors

Oklahoma University

2122 Tutors

Pennsylvania State University

932 Tutors

Princeton University

1211 Tutors

Stanford University

983 Tutors

University of California

1282 Tutors

Oxford University

123 Tutors

Yale University

2325 Tutors