Discussion:
Q: 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
State the alternative hypothesis?
A) H1:uD ≠ 0 B) H1: uD < 0 C) H1: uD = 0 D) H1: uD ≥ 0