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Exam 8: Interval Estimation

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Question 61

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A 95% confidence interval for a population mean is determined to be 100 to 120. If the confidence coefficient is reduced to .90, the interval for μ _____.

A) becomes narrower
B) becomes wider
C) does not change
D) becomes .1

E) A) and B)
F) C) and D)

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Question 62

Multiple Choice

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A random sample of 25 employees of a local company has been measured. A 95% confidence interval estimate for the mean systolic blood pressure for all company employees is 123 to 139. Which of the following statements is valid?

A) 95% of the sample of employees has a systolic blood pressure between 123 and 139.
B) If the sampling procedure were repeated many times, 95% of the resulting confidence intervals would contain the population mean systolic blood pressure.
C) 95% of the population of employees has a systolic blood pressure between 123 and 139.
D) If the sampling procedure were repeated many times, 95% of the sample means would be between 123 and 139.

E) A) and B)
F) A) and C)

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Question 63

Multiple Choice

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The probability that the interval estimation procedure will generate an interval that contains the actual value of the population parameter being estimated is the _____.

A random sample of 25 statistics examinations was selected. The average score in the sample was 76 with a variance of 144. Assuming the scores are normally distributed, the 99% confidence interval for the population average examination score is _____.

In determining the sample size necessary to estimate a population proportion, which of the following is NOT needed?

Whenever the population standard deviation is unknown, which distribution is used in developing an interval estimate for a population mean?

In determining the sample size necessary to estimate a population proportion, which of the following is NOT needed?

A newspaper wants to estimate the proportion of Americans who will vote for Candidate A. A random sample of 1000 voters is selected. Of the 1000 respondents, 526 say that they will vote for Candidate A. Which Excel function would be used to construct a confidence interval estimate?

If we want to provide a 95% confidence interval for the mean of a population, the confidence coefficient is _____.

The expression used to compute an interval estimate of μ may depend on any of the following factors EXCEPT _____.

Below you are given ages that were obtained by taking a random sample of nine undergraduate students. 19 22 23 19 21 22 19 23 21 Use Excel to determine an interval estimate for the mean of the population at a 99% confidence level. Interpret your results.

A manufacturer wants to estimate the proportion of defective items that are produced by a certain machine. A random sample of 50 items is selected. Which Excel function would NOT be appropriate to construct a confidence interval estimate?

When the level of confidence increases, the confidence interval _____.

If the margin of error in an interval estimate of ? is 4.6, the interval estimate equals _____.

An estimate of a population parameter that provides an interval believed to contain the value of the parameter is known as the _____.