1. Return to the ‘cars.xlsx’ dataset that was used in the Unit 6 Homework. Recall that this dataset includes data on the 0-60 time (TIME), top speed (SPEED), curb weight (WEIGHT), and horsepower (HP) of 30 automobiles.
There are good reasons based in physics to believe that the relationship between horsepower and 0-60 time is non-linear. Look again at the scatter plot of HP (x-axis) and 0-60 time (y-axis) from the Unit 6 Homework. To test the goodness of fit of one possible non-linear relationship estimate the following quadratic regression: TIMEi = β0 + β1HPi + β2HPi2 + ε Please include your regression results with your answers (and submit the excel file to the D2L dropbox for the Unit 7 Homework).
Compare the results from this regression to those from the Unit 6 Homework. Which do you prefer and why?
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