(A) Assume that the national average weekly grocery bill for a five-person family is $131. Is the sample evidence statistically significant? If so, at what significance levels can you reject the null hypothesis?
(B) For which values of the sample mean (i.e., average weekly grocery bill) would you decide to reject the null hypothesis at the 
significance level? For which values of the sample mean would you decide to reject the null hypothesis at the 10% level of significance?
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