A Major Retail Clothing Store Is Interested in Estimating the Difference

question 37

Multiple Choice

A major retail clothing store is interested in estimating the difference in mean monthly purchases by customers who use the store's in-house credit card versus using a Visa,Mastercard,or one of the other major credit cards.To do this,it has randomly selected a sample of customers who have made one or more purchases with each of the types of credit cards.The following represents the results of the sampling: Given this information,which of the following statements is true?

• A)If either of the sample sizes is increased,the resulting confidence interval will have a smaller margin of error.
• B)If the confidence level were changed from 95 percent to 90 percent,the margin of error in the estimate would be reduced.
• C)Neither A nor B are true.
• D)Both A and B are true.

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Definitions:

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Australopithecus Robustus

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Use Fire

The ability to control and manipulate fire, a significant technological and cultural development in human history.