Automobiles manufactured by the Efficiency Company have been averaging 42 miles per gallon of gasoline in highway driving. It is believed that its new automobiles average more than 42 miles per gallon. An independent testing service road-tested 36 of the automobiles. The sample showed an average of 42.8 miles per gallon with a standard deviation of 1.2 miles per gallon. With a 0.05 level of significance using the p-value value approach, test to determine whether or not the new automobiles actually do average more than 42 miles per gallon. Clearly write down all four steps including the conclusion.
