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Exam 14: Sample Size Determination

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Question 31

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All of the statistical methods for determining sample size in this chapter assume which of the following?

A) a large population
B) a valid questionnaire
C) simple random sampling
D) stratified sampling
E) none of these

F) C) and D)
G) B) and C)

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Question 32

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The normal distribution is bell-shaped and has only one mode.

A) True
B) False

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Question 33

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Budget is rarely a consideration when determining sample size.

Holding constant at a 95% level of confidence,if the standard deviation increases,then the sample size required to represent the population in question will be _______.

A researcher wants to estimate a population mean.The level of tolerable sampling error is 0.2 of a purchase occasion,with a confidence level of 95.44%.If the estimated population variance is 5 for the most important question in the study,what is the desired sample size?

A researcher wants to know the average number of times per month respondents eat at fast food restaurants.The statistic that s/he is most interested in would be the_________.

A particular normal distribution is not uniquely defined by its mean and standard deviation.

Which of the following is not a determinant of sample size for probability samples?

As the level of tolerable error increases in the sample means formula,the sample size required to represent a particular population is:

Statistical power is the probability of making a type II error.

Higher levels of confidence generally require:

The results of a sample can be used to generate which of the following concerning the population mean?

Online interviewing and Internet panels,along with social-media-driven sampling,have had no impact concerning feasible sample sizes.

A(n) ____________ normal distribution is a normal distribution with a mean of zero and a standard deviation of one.

In addition to being interested in estimating sampling means,marketing researchers frequently are interested in estimating proportions or percentages.

Assuming the research objectives of the study can be accomplished,researchers would much prefer to estimate the required sample size using the sample proportion formula rather than the sample means formula.Why?

The proportional property of a normal distribution provides the basis for the statistical inferences.

About 68% of the area under a standard normal curve covers one _________.