One of the Important Factors Determining a Car's Fuel Efficiency

question 12

Multiple Choice

One of the important factors determining a car's fuel efficiency is its weight.This relationship is examined for 11 cars,and the association is shown in the scatterplot below.
If a linear model is considered,the regression analysis is as follows:
Dependent variable: MPG
R-squared = 84.7%
VARIABLE COEFFICIENT
Intercept 47.1181
Weight -7.34614
What does the slope say about this relationship?

• A)Gas mileage increases an average of 7.346 mpg for each thousand pounds of weight.
• B)Gas mileage decreases an average of 7.346 mpg for each thousand pounds of weight.
• C)Gas mileage increases an average of 4.712 mpg for each thousand pounds of weight.
• D)Gas mileage decreases an average of 4.712 mpg for each thousand pounds of weight.
• E)Gas mileage decreases an average of .7346 mpg for each thousand pounds of weight.

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