Answer Happy

APPLYING THE CONCEPTS SELF 9.22 You are the manager of a restaurant for a Test fast-food franchise. Last month, the mean waiting time at the drive-through window for branches in your geo- graphical region, as measured from the time a customer places an order until the time the customer receives the order, was 3.7 minutes. You select a random sample of 64 orders. The sample mean waiting time is 3.57 minutes, with a sam- ple standard deviation of 0.8 minute. a. At the 0.05 level of significance, is there evidence that the population mean waiting time is different from 3.7 minutes? b. Because the sample size is 64, do you need to be con- cerned about the shape of the population distribution when conducting the t test in (a)? Explain.