Exhibit 10-6 The Management of a Department Store Is Interested in Estimating

Multiple Choice

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.
-Refer to Exhibit 10-6. A 95% confidence interval estimate for the difference between the average purchases of the customers using the two different credit cards is

A) 49 to 64
B) 11.68 to 18.32
C) 125 to 140
D) 8 to 10