In a large supermarket the customer’s waiting time to check out is approximately normally distributed with a standard deviation of 2.5 minutes. A sample of 24 customer waiting times produced a mean of 10.6 minutes. Is this evidence sufficient to reject the supermarket’s claim that its customer checkout time averages no more than 9 minutes? Complete this hypothesis test using the 0.02 level of significance.
a. Solve using the p-value approach.
b. Solve using the classical approach.