Answer Happy

Question 1: (Two-Tail test for the mean) You are the manager of a fast-food restaurant. You want to determine whether the waiting time to place an order has changed in last month from its previous population mean value of 4.5 minutes. From past experience, you can assume that the population standard derivation is 1.2 minutes. You selected a sample of 25 orders during a one-hour period. The sample mean is 5.1 minutes. Use the six step approach to determine whether there is evidence at the 0.05 level of significance that the mean waiting time to be place an order has changed in the last month from its previous population mean value of 4.5 minutes. Required: a) Answer this question by Critical Value approach b) Answer this question by P-value approach