MIntroStat9 6.E.136. [3878390] Question Details Consumers can purchase nonprescr

Question

MIntroStat9 6.E.136. [3878390] Question Details Consumers can purchase nonprescription medications at food stores, mass merchandise stores such as Target and Wal-Mart, or pharmacies. About 45% of consumers make such purchases at pharmacies. What accounts for the popularity of pharmacies, which often charge higher prices? A study examined consumers' perceptions of overall performance of the three types of stores, using a long questionnaire that asked about such things as "neat and attractive store," "knowledgeable staff," and "assistance in choosing among various types of nonprescription medication." A performance score was based on 27 such questions. The subjects were 197 people chosen at random from the Indianapolis telephone directory. Here are the means and standard deviations of the performance scores for the sample. Store type Food stores Mass merchandisers 32.21 33.18 Pharmacies 18.9 24.88 48.79 35.73 We do not know the population standard deviations, but a sample standard deviation s from so large a sample is usually close

Explanation / Answer

a) The authors of the study want to draw conclusions about the CONSUMERS.

* I am certain that they can draw cinclusions about the CITIZENS OF INDIANAPOLIS. Because subjects are chosen from the Indianapolis telephone directory.

b) 99% confidence interval

FOOD STORES = (14.34,23.46)

MASS MERCHANDISERS - (26.13,38.29)

PHARMACIES - (42.24,55.34)

c) From above confidence intervals we can easily say rhat.

YES, THE PHARMCY INTERVAL IS WELL ABOVE THE OTHERS.

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