Question

You are the manager of a restaurant for a​ fast-food franchise. Last​ month, the mean waiting time at the​ drive-through window for branches in your geographical​ region, as measured from the time a customer places an order until the time the customer receives the​ order, was 3.9 minutes. You select a random sample of 81 orders. The sample mean waiting time is 4.05 ​minutes, with a sample standard deviation of 0.9 minute. At the 0.01 level of​ significance, is there evidence that the population mean waiting time is different from 3.9 ​minutes? State the null and alternative hypotheses Determine the test statistic.(two decimal places) Find the​ p-value.(three decimal places) What is the conclusion? Do i need to be concerned about the shape of the population distribution?

Answer 1