Three Different Models of Automobiles (A, B, and C) Were $\alpha$

Essay

Three different models of automobiles (A, B, and C) were compared for gasoline consumption. For each model of car, fifteen cars were randomly selected and subjected to standard driving procedures. The average miles/gallon obtained for each model of car and sample standard deviations are shown below. Use the above data and test to see if the mean gasoline consumption for all three models of cars is the same. Let $\alpha$ = 0.05, and use both the critical and p-value approaches.