Which of the following is correct and most complete?

a. The optional first step involving scaling can affect VIF values.

b. Least squares coefficient estimates minimize the sum of squared residuals.

c. VIFs are not influenced by outliers unless the points are removed.

d. Changing the last input in Table 15.3

(a) to 44 would make the VIFs undefined.

e. All of the above are correct.

f. All of the above are correct except

(a) and (e).

Table 15.11 is relevant to Questions 6-9. Assume that the model form being fitted is a first order polynomial in factors x1 and x2 only, unless otherwise mentioned.