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Question 40

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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. Use the following to answer questions 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 X<sub>1</sub> and X<sub>2</sub> as given in the table. Consequently, D = X<sub>1</sub>-X<sub>2</sub>. -Compute the standard deviation of the differences. A) 0.84 B) 0.78 C) 0.13 D) 0.11
-Compute the standard deviation of the differences.


A) 0.84
B) 0.78
C) 0.13
D) 0.11

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