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 size64
49
Sample mean$140
$120
Population standard deviation$10
$8
?
A point estimate for the difference between the mean purchases of all users of the two credit cards is
A. 20.
B. 2.
C. 260.
D. 15.
Answer: A
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