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
?
At 95% confidence, the margin of error is

A. 1.694.
B. 3.32.
C. 1.96.
D. 15.


Answer: B

Business

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