Question: The parking manager for the Los Angeles Dodgers baseball team has studied the exit times for cars leaving the ballpark after a gaMeand believes that recent changes to the traffic flow leaving the stadium have increased, rather than decreased, average exit times. Prior to the changes, the previous mean exit time per vehicle was 36 minutes, with a population standard deviation equal to 11 minutes. To test his claim, he collects a random sample of 200 vehicles that has a sample mean of 36.8 minutes.

(a) Formulate the null and alternative hypotheses. Label the claim.

(b) Test the claim at the 5% level of significance. Use either the p-value method or rejection regions. List the numbers you calculated. State the decision rule. Explain why?

(c) State a conclusion about the claim in terms of the “real-world” significance of the problem.