The owner of Ranch Style Burgers wants to determine if its speed of service is different across its four outlets.

Orders at the Ranch Style restaurants are tracked electronically, and the chain is able to determine the speed with which every order is filled. The owner decided to randomly sample 20 orders from each of the four restaurants it operates. The speed of service for each randomly sampled order was noted and is contained in the file Ranch Style.

a. At the a = 0.05 level of service, can the Ranch Style owner conclude that the speed of service is different across the four restaurants in the chain?

b. If the chain concludes that there is a difference in speed of service, is there a particular restaurant the chain should focus its attention on? Use the appropriate test for multiple comparisons to support your decision. Use a = 0.05.