Use the Following to Answer Questions

question 40

Multiple Choice

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 X₁ and X₂ as given in the table. Consequently, D = X₁-X₂.
-Compute the standard deviation of the differences.

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

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Definitions:

Driving Ability

A set of skills and capabilities required to operate a vehicle safely, including motor coordination, cognitive comprehension, and adherence to traffic laws.

BAL

Blood Alcohol Level, a measurement of alcohol intoxication for legal and medical purposes.

Small Intestine

A part of the gastrointestinal tract between the stomach and large intestine that absorbs nutrients and minerals from food.

Bloodstream

is the flowing fluid in the circulatory system of the body, through which blood is pumped to carry nutrients, oxygen, and waste products to and from the cells.