Exhibit 10-6The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card. You are given the following information. Assume the samples were selected randomly. Store's CardMajor Credit CardSample size6449Sample mean$140$125Population standard deviation$10$8Refer to Exhibit 10-6. A 95% confidence interval estimate for the difference (Store's Card – Major Credit Card) between the average purchases of the customers using the two different credit cards is _____.Group of answer choices49 to 6411.68 to 18.32125 to 1408 to 10

The point estimate for the difference between the mean purchases of the users of the two credit…

Answered: Exhibit 10-6 The management of a…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Exhibit 10-6
The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card. You are given the following information. Assume the samples were selected randomly.

	Store's Card	Major Credit Card
Sample size	64	49
Sample mean	$140	$125
Population standard deviation	$10	$8

Refer to Exhibit 10-6. A 95% confidence interval estimate for the difference (Store's Card – Major Credit Card) between the average purchases of the customers using the two different credit cards is _____.

Group of answer choices

49 to 64

11.68 to 18.32

125 to 140

8 to 10

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