The following exercise provides us with an excellent example of the ways in which basic statistical analyses can be used - and indeed are used - in everyday transactions. In the problem before us, we have information about the credit card balances that are currently held by male and female customers of the Capital Bank. Its marketing department wishes to know if men or women typically keep a higher balance on their credit cards and, if one group does indeed do so, if the other group can be lured into increasing their balances.
Following are the calculations of mean and variance. The mean is the a
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