Margin of error when confidence is given

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Reference no: EM1314565

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

Reference no: EM1314565

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