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Hypothesis test for single mean.

Automobiles manufactured by the Efficiency Company have been averaging 42 miles per gallon of gasoline in highway driving. It is believed that its original automobiles average more than 42 miles per gallon. An independent testing services road-tested 36 of automobiles. The sample showed an average of 42.8 miles per gallon with the standard deviation of 1.2 miles per gallon.

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