Can we predict the Horsepower of the engine that manufacturers will put in a car by knowing the Weight of the car? Here are the regression analysis and residuals plot:

a) Write the equation of the regression line.

b) Do you think the car’s Weight is measured in pounds or thousands of pounds?

c) Do you think this linear model is appropriate? 

d) The highest point in the residuals plot, representing a residual of 22.5 horsepower, is for a Chevy weighing 2595 pounds. How much horsepower does this car have?

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Residuals (horsepower) 12.5 0.0 -12.5 Dependent variable is Horsepower R-squared = 84.1% Variable Coefficient 3.49834 Intercept Weight + 80 34.3144 ● + + 100 120 Predicted (horsepower) + 140