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Hypothesis Testing

A researcher wanted to determine if using an octane booster would increase gasoline mileage. A random sample of seven cars was selected; the cars were driven for two weeks without the booster and two weeks with the booster.

Miles /Gal Without Miles / Gal With
21.2 23.8
25.4 25.6
20.9 22.4
27.6 28.3
22.8 24.5
27.3 28.8
23.4 25.2

30. State the alternative hypothesis?

A) H1: uD &#8800; 0 B) H1: uD < 0 C) H1: uD = 0 D) H1: uD &#8805; 0

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