The owner of a café has recently surveyed a random sample of n = 250 customers of the café. She would now like to determine whether or not the mean age of her customers is over 30. If so, she plans to make a renovation to older customers. If not, no renovation changes will be made. Suppose she found that the sample mean was 30.45 years and the sample standard deviation was 5 years. If she wants to be 99% confident in her decision, what decision should she make?    Reject H0.   Accept H0.   Fail to reject H0.   We cannot tell what her decision should be from the information given.

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