Can you answer these please?

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.

    1315141612

    The point estimate of the population mean

4 points  

QUESTION 2

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

    161918172018

    The point estimate of the population standard deviation is

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 mc074-1.jpg 5

    n(1 - p) mc074-2.jpg 5 and n mc074-3.jpg 30

    mc074-4.jpg 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

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

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

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

4 points  

QUESTION 8

  1. In general, higher confidence levels provide

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

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

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

4 points  

QUESTION 12

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

4 points  

QUESTION 13

  1. In a random sample of 144 observations, mc043-1.jpg = 0.6. The 95% confidence interval for P is

4 points  

QUESTION 14

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

    1081111

    The 95% confidence interval for m is

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


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(Top Tutor) Daniel C.
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School: UCLA
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