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Exam 10: Determining the Size of a Sample

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Question 21

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The most correct method of determining sample size is the confidence interval approach,which applies the concepts of all of the following EXCEPT:

A) Accuracy(margin of sample error) .
B) Variability.
C) Confidence interval to create a"correct"sample size.
D) Validity and value.

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

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Question 22

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How does a researcher determine the amount of acceptable sample error? What is the role of marketing research director in determining the amount of acceptable sample error?

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Question 23

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A marketing researcher should have a basic understanding of sample size determination because:

Marketing researchers often must help decision makers ________ of their requests for high precision,expressed as acceptable sample error.

Adopting past sample sizes or taking those used by other companies may not take into consideration that:

A random sample will always have some inaccuracy,which is referred to as margin of sample error or simply sample error.

Thousands of consumers have joined online panels,which are mega-populations that represent consumer markets of many types.

It is common practice for marketing researchers,particularly the do-it-yourselfers,to consider ________ to be a random sample.

If the level of confidence(1.96 for 95 percent) is known,variability estimates,and the size of a sample,there is a formula that allows us to determine:

Define the terms variability,confidence interval,and acceptable margin of sample error.

The most correct method of determining a sample size is:

In almost all cases,the margin of sample error of a random sample is ________ the size of the population.

When estimating a standard deviation,researchers may rely on prior knowledge of the population(previous study) ,a pilot study,or:

Researchers can estimate variability in three ways.Which of the following is NOT one of the three ways a researcher may estimate variability?

The statement"a sample size decision is usually a compromise between what is theoretically perfect and what is practically feasible"underscores the importance of why a marketing researcher should have a basic understanding of sample size determinations.List and describe the two primary reasons why a marketing researcher should have this basic understanding.

When a researcher wishes to perform a particular type of data analysis that has sample size requirements,he or she may use what type of approach?

Because the sampling process is imperfect,it is inappropriate to use an estimate of sampling error in the calculation of this range.

Using a panel company is inexpensive,expedient,and guarantees delivery of the specified number of completed surveys.

A random sample size can be a very tiny percent of the population size and still have a small margin of sample error.

The accuracy of a sample is a measure of how closely it reports the true values of the population it represents.