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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
Find the percent of a standard Normal model found in the given region. Round to the nearest hundredth of a percent.
For the mold described in (g), can you find the probability that it's COST value will exceed $150,000? If yes, obtain this probability. If no, why not?
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