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Question
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.
| Store's Card | Major Credit Card | |
| Sample size | 64 | 49 |
| Sample mean | $140 | $125 |
| Population standard deviation | $10 | $8 |
a. 2
b. 18
c. 265
d. 15
Answer
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