Answered: Which supermarket has the lowest prices…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

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 x_B = 1.99 d = .10
s_A = 0.22 s_B = 0.19 s_d = .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 μ_A equals μ_B.

B. None of these interpretations is correct.

C. We are 95% confident that μ_A is larger than μ_B.

D. We are 95% confident that μ_B is larger than μ_A.

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