Suppose a manager at a local Domino’s Pizza would like to determine if the average time it takes to deliver a pizza and return to the store differs for the four employees who make the deliveries. The following data show a random sample of the delivery times for each driver. These data can also be found in the Excel file Dominos.xlsx.

Driver 1 Driver 2 Driver 3 Driver 4 40 16 27 21 32 9 24 7 28 13 13 34 29 22 9 14 40 10

a. Using a = 0.05, determine if the manager has enough evidence to conclude there is a difference in the delivery times of the four drivers.

b. If warranted, perform a multiple comparison test to determine which pairs are different using a = 0.05.

c. Verify your results with Excel or PHStat.

AppendixLO1