A major oil company has developed a new gasoline additive that is supposed to increase mileage. To test this hypothesis, ten cars are randomly selected. The cars are driven both with and without the additive. The results are displayed in the following table. Can it be concluded, from the data, that the gasoline additive does significantly increase mileage? Car Without additive 25.5 27.7 19.5 22.4 9.9 21.1 13.1 26.7 20.6 24.9 With additive 25.7 28.6 21.4 25.7 13.4 21.7 14.6 30 23 26.5

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