Assume you are employed by a consumer-products rating service and your assignment is to assess car batteries. For this part of your investigation, you want to determine whether there is a difference in life of each battery. The following are the results given in months of useful battery life:
Battery Manufacturer
A B C
56 46 44
57 52 53
55 51 50
59 50 51
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a. Use the analysis of variance with _ _ 0.05 to determine whether there is a difference among these three brands of batteries.
b. Suppose you are asked to make a recommendation regarding the batteries based on useful life. Use the Tukey HSD test with _ _ 0.05 to help you with your decision.