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.

Question

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.

Quizplus · Accepted Answer

The slope of -7.34614 means that as weight increases by 1000 pounds, gas mileage decreases by an average of 7.346 mpg.

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