You are the manager of a fast food restaurant. You want to determine whether the waiting to place an order has changed in the last month from its previous population mean value of 4.5 minutes. From past experience, you can assume that the population standard deviation is 1.2 minutes. You select a sample of 25 orders during a one-hour period. The sample mean is 5.1 minutes. USE THE 6-STEP APPROACH in chapter 9 to determine whether there is evidence at the .05 level of significance that the mean waiting time is place an order has changed in the last month from its previous mean value of 4.5 minutes. (You must do all 6 steps to receive credit for this problem)