Which supermarket has the lowest prices in town? All claim to be cheapest, but an independent agency recently was asked to investigate this question. The agency randomly selected 100 items common to...


Which supermarket has the lowest prices in town? All claim to be cheapest, but an independent agency recently was asked to investigate this question. The agency randomly selected 100 items common to each of two supermarkets (labelled A and B for confidentiality) and recorded the prices charged by each supermarket. The summary results are provided below:



xA
= 2.09  xB
= 1.99  d = .10
sA = 0.22 sB = 0.19 sd = .03


Suppose the 95% confidence interval turned out to be (-.12, .02). Which of the following interpretations is correct?


Select one:


A. We are 95% confident that μA equals μB.

B. None of these interpretations is correct.

C. We are 95% confident that μA is larger than μB.

D. We are 95% confident that μB is larger than μA.




Jun 09, 2022
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