Use the Following Information for Questions:
a Car Salesman $\overline{x}$

Short Answer

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.

-Calculate a 98% confidence interval for the average fuel efficiency for all cars that hold 18 gallons of fuel. Descriptive statistics for the two variables are provided below. Use the mean to obtain $\overline{x}$ and the variance to calculate . Use these two values then to calculate s.e.(fit).