A shipping company claims that the average delivery time for itsnext day shipping service is 22 hours. However, a group ofcustomers believe that the mean delivery time is longer than 22hours. Suppose that a random sample of 78 next day deliveries bythe company yields a mean delivery time of 23.5 hours with astandard deviation of 4.8 hours.
a) State the null and alternative hypotheses to the company'sclaim.
b) In the context of the problem, explain a type 1 error and type 2error.
c) Find the value of the test statistic.
d) Compute the p-value and use it to make your decision at theα=0.05 significance lever.

Answer rating: 100% (QA)

However a group of customers believe that the mean delivery time is longer than 22 hours The part in ... View the full answer