Determine the alternative hypothesis.
A researcher wanted to determine if using an octane booster would enhance 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
|
Status the alternative hypothesis?
a.H1: μD _ 0
b.H1: μD < 0
c.H1: μD = 0
d.H1: μD _ 0