Exam 10: Determining the Size of a Sample

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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?

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

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

(True/False)
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In almost all cases,the margin of sample error of a random sample is ________ the size of the population.

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

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

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

(True/False)
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Define the terms variability,confidence interval,and acceptable margin of sample error.

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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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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.

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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:

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

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

(True/False)
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Adopting past sample sizes or taking those used by other companies may not take into consideration that:

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

(True/False)
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The most correct method of determining a sample size is:

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

(True/False)
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A marketing researcher should have a basic understanding of sample size determination because:

(Multiple Choice)
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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:

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

(Multiple Choice)
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