Question

28. You are the manager of a restaurant for a​ fast-food franchise. Last​ month, the mean...

28. 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 3.8 minutes. You select a random sample of 81 orders. The sample mean waiting time is 3.99 minutes, with a sample standard deviation of 0.9 minute.

At the 0.10 level of​ significance, is there evidence that the population mean waiting time is different from 3.8 ​minutes? State the null and alternative hypotheses.

Determine the test statistic.

Find the​ p-value.

State the conclusion.

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