A national grocer's magazine reports the typical shopper spends 8 minutes In line walting to check out. A sample of 18 shoppers at the local Farmer Jack's showed a mean of 71 minutes with a standard deviation of 27 minutes. Is the walting time at the local Farmer Jack's less than that reported In the national magazine? Use the 0.100 significance level. a. What Is the decision rule? (Negative amount should be indicated by a minus sign. Round your answer to 3 decimal places.) Reject HO: p 2 8 and fail to reject H1: p