The model in Exercise 30 is missing one predictor that we might have expected to see. Engine Displacement is highly correlated 1r = 0.7832 with MSRP, but that variable has not entered the model (and, indeed, would have a P-value of 0.54 if it were added to the model). Here is some evidence to explain why that may be.

a) What term describes the reason Displacement doesn€™t contribute to the regression model for MSRP?
b) Find the value of the Variance Inflation Factor for Displacement in the regression on MSRP.

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Dependent variable is: Displacement R-squared 95.9% R-squared (adjusted) 95.7% s 35.54 with 100 6 94 degrees of freedom Variable Intercept Bore Clearance Engine Stroke-27.3943 5.2645.20 <0.0001 Total Weight Wheelbase SE(Coeff) t ratio P-value 166 0.8682 0.0001 0.2460 Coeff -8.05901 48.42 9.10890 0.360 25.3 3.55912 3.048 1.17 1.03749 0.1768 5.87 0.0001 -10.0612 2.008-6.01 <0.0001