The manager of a fast food restaraunt wants to determine whether the population mean waiting time to place an order ha changed in the past month from its previous value of 3.7 minutes. A random sample of 64 orders shows a mean waiting time of 4.0 minutes. It is known from past experience that the population standard deviation of waiting time is o = 1.15 minutes
Formulate and test the appropriate hypotheses using the p-value approach. What is the p-value for the test? Should the research firm reject the null hypotheses at a=0.05? What conclusion should they make?