Exhibit 3 The management of a department store is interested in estimating the difference between the...

Exhibit 3
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.

	Store's Card	Major Credit Card
Sample size	164	89
Sample mean	$140	$135
Population standard deviation	$10	$8

Refer to Exhibit 3. A 95% confidence level the interval estimate for the difference between the average purchases of the customers using the two different credit cards is

Select one:

a. $2.19 to $8.48

b. $2.02 to $7.97

c. $2.56 to $8.41

d. $2.83 to $7.10

Expert Solution

orchestra answered 2 years ago

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