You are the manager of a restaurant that delivers to college dormitory rooms. you have just changed delivery process in an effort to reduce the mean time between the order and completion of delivery from the current 25 minutes. a sample of 36 orders using the new delivery process yields a sample mean of 22.4 minutes and a sample standard deviation of 6 minutes.
a. Is there evidence at the 0.05 level of significance that the mean amount has been reduced below the previous population mean of 25 minutes using the six step hypothesis testing approach?
b. Compute the p-value and interpret its meaning.