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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
64
49
Sample mean
$140
$125
Population standard deviation
$10
$8
At 95% confidence, the margin of error is:
A. 1.694
B. 3.32
C. 1.96
D. 15
Below you are given a partial computer output based on a sample of 16 observations.
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