SOLUTION: Use the following to answer questions 74-75:
A researcher wanted to determine if using an octane booster would increase gasoline mileage. A random sample of seven cars was select
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-> SOLUTION: Use the following to answer questions 74-75:
A researcher wanted to determine if using an octane booster would increase gasoline mileage. A random sample of seven cars was select
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Question 727226: Use the following to answer questions 74-75:
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. Use the definitions of X1 and X2 as given in the table. Consequently, D = X1–X2.
Gasoline Mileage
Without booster, X1
(mpg) Gasoline Mileage
With booster, X2
(mpg)
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
___ 74. What critical value should be used at α = 0.05?
A) –2.447 B) –2.365 C) –1.943 D) –1.895
___ 75. Determine the mean of the differences.
A) –1.67 B) 6.3 C) 1.67 D) –1.43
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