4. C)The manager of Bells department store has assumed that the mean annual income of the stores credit-card customers is greater than $28,000 per year and a standard deviation of $3,000. If this is not the case, the manager needs to change the credit limit on the store's credit-card. A sample of 100 credit-card customers shows a sample mean of $29,000. At a .05 level of statistical significancetest the manager'sassumption.

What is the sign of the alternate hypothesis?

Less than

Greater than

Not equal to

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