Question: Consider the data in Problem 7.2. a. Fit a second - order model y = 0 + 1x + 11x2 + to the data.

Consider the data in Problem 7.2.

a. Fit a second - order model y = β0 + β1x + β11x2

+ ε to the data. Evaluate the variance infl ation factors.

b. Fit a second - order model y xx x =+ − ββ β 0 1 11 ( ) + − ( ) + ε 2 x to the data.

Evaluate the variance infl ation factors.

c. What can you conclude about the impact of centering the x ’ s in a polynomial model on multicollinearity?

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