How's your mileage? Weight (in tons) and fuel economy (in mpg) were measured for a sample of seven diesel trucks. The results are presented in the following table.

a. Compute the least-squares regression line for predicting mileage from weight.
b. Construct a residual plot. Verify that a linear model is appropriate.
c. If two trucks differ in weight by 5 tons, by how much would you predict their mileages to differ?
d. Predict the mileage for trucks with a weight of 15 tons.

Transcribed Image Text:

Weight 8.00 24.50 27.00 14.50 28.50 12.75 21.25 Mileage 7.69 4.97 4.56 6.49 4.34 6.24 4.45