Question: Create a (Speed)2 term (called Speed Sq) and incorporate that term into your regression model to predict MPG: MPG = 0 + 1(Speed) + 2(Displacement)

Create a (Speed)2 term (called Speed Sq) and incorporate that term into your regression model to predict MPG: MPG = β0 + β1(Speed) + β2(Displacement) + β3(Speed Sq).
a. What are the regression equation and R2 value?
b. Look at residual versus Speed and residual versus Displacement plots. Describe any changes when (Speed)2 is added to the model.
c. What does the residual normal probability plot show?

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