Use the following information for questions:
A car salesman is curious if he can predict the fuel efficiency of a car (in MPG) if he knows the fuel capacity of the car (in gallons). He collects data on a variety of makes and models of cars. The scatterplot shows that a linear model is appropriate. SPSS output is provided below.

-How would the 95% confidence interval for the average fuel efficiency for all cars that hold 18 gallons of fuel compare to the interval calculated in question 89?
A) Narrower
B) Wider

Question

Use the following information for questions:
 A car salesman is curious if he can predict the fuel efficiency of a car (in MPG) if he knows the fuel capacity of the car (in gallons). He collects data on a variety of makes and models of cars. The scatterplot shows that a linear model is appropriate. SPSS output is provided below.
   
-How would the 95% confidence interval for the average fuel efficiency for all cars that hold 18 gallons of fuel compare to the interval calculated in question 89?
A) Narrower 
B) Wider

Quizplus · Accepted Answer

The confidence interval for the average fuel efficiency for all cars that hold 18 gallons of fuel would be narrower than the interval calculated in question 89 because the sample size is larger.

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