Sigchi4life
Category:
Statistics
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Question description

### QUESTION 1

1. The following data was collected from a simple random sample of a population.

 13 15 14 16 12

The point estimate of the population mean

 cannot be determined, since the population size is unknown is 14 is 4 is 5

4 points

### QUESTION 2

1. The following information was collected from a simple random sample of a population.

 16 19 18 17 20 18

The point estimate of the population standard deviation is

 2 1.291 1.414 1.667

4 points

### QUESTION 3

1. As a rule of thumb, the sampling distribution of the sample proportions can be approximated by a normal probability distribution whenever

 np  5 n(1 - p)  5 and n  30 n  30 and (1 - p) = 0.5 None of these alternatives is correct.

4 points

### QUESTION 4

1. Random samples of size 36 are taken from an infinite population whose mean and standard deviation are 20 and 15, respectively. The distribution of the population is unknown. The mean and the standard error of the mean are

 36 and 15 20 and 15 20 and 0.417 20 and 2.5

4 points

### QUESTION 5

1. A population has a mean of 180 and a standard deviation of 24. A sample of 64 observations will be taken. The probability that the sample mean will be between 183 and 186 is

 0.1359 0.8185 0.3413 0.4772

4 points

### QUESTION 6

1. A random sample of 150 people was taken from a very large population. Ninety of the people in the sample were female. The standard error of the proportion is

 0.0016 0.24 0.16 0.04

4 points

### QUESTION 7

1. A sample of 66 observations will be taken from an infinite population. The population proportion equals 0.12. The probability that the sample proportion will be less than 0.1768 is

 0.0568 0.0778 0.4222 0.9222

4 points

### QUESTION 8

1. In general, higher confidence levels provide

 wider confidence intervals narrower confidence intervals a smaller standard error unbiased estimates

4 points

### QUESTION 9

1. Exhibit 8-3The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took these 100 customers to check out was 3.0 minutes. It is known that the standard deviation of the population of checkout times is one minute.

Refer to Exhibit 8-3. With a .95 probability, the sample mean will provide a margin of error of

 1.96 0.1 0.196 1.64

4 points

### QUESTION 10

1. Exhibit 8-1In order to estimate the average time spent on the computer terminals per student at a local university, data were collected for a sample of 81 business students over a one-week period. Assume the population standard deviation is 1.8 hours.

Refer to Exhibit 8-1. If the sample mean is 9 hours, then the 95% confidence interval is

 7.04 to 110.96 hours 7.36 to 10.64 hours 7.80 to 10.20 hours 8.61 to 9.39 hours

4 points

### QUESTION 11

1. Exhibit 8-2A random sample of 121 automobiles traveling on an interstate showed an average speed of 65 mph. From past information, it is known that the standard deviation of the population is 22 mph.

Refer to Exhibit 8-2. The 96.6% confidence interval for m is

 63.00 to 67.00 60.76 to 69.24 61.08 to 68.92 60.00 to 80.00

4 points

### QUESTION 12

1. The t value for a 95% confidence interval estimation with 24 degrees of freedom is

 1.711 2.064 2.492 2.069

4 points

### QUESTION 13

1. In a random sample of 144 observations,  = 0.6. The 95% confidence interval for P is

 0.52 to 0.68 0.144 to 0.200 0.60 to 0.70 0.50 to 0.70

4 points

### QUESTION 14

1. The following random sample from a population whose values were normally distributed was collected.

 10 8 11 11

The 95% confidence interval for m is

 8.52 to 10.98 7.75 to 11.75 9.75 to 10.75 8.00 to 10.00

4 points

### QUESTION 15

1. A machine that produces a major part for an airplane engine is monitored closely. In the past, 10% of the parts produced would be defective. With a .95 probability, the sample size that needs to be taken if the desired margin of error is .04 or less is

 110 111 216 217

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