Question: A study is conducted to compare gas mileage for 3 competing brands of gasoline. Four different automobile models of varying size are randomly selected. The

A study is conducted to compare gas mileage for 3 competing brands of gasoline. Four different automobile models of varying size are randomly selected. The data, in miles per gallon, follow. The order of testing is random for each model.

1. Discuss the need for the use of more than a single model of car.

2. Consider the ANOVA from the SAS printout in Figure 13.17 on page 578. Does brand of gasoline matter?

3. Which brand of gasoline would you select? Consult the result of Duncan’s test.

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