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. 
At 95% confidence, the margin of error is
Definitions:
Earnings Ratio
Typically refers to the price-to-earnings (P/E) ratio, which measures a company's current share price relative to its per-share earnings.
Annual Earnings
The total amount of money earned by an individual or entity in one year, often before taxes.
Earnings Ratio
Earnings ratio typically refers to financial metrics that compare various aspects of a company's earnings to other measures, such as its share price in the price-to-earnings ratio.
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