For the multiple linear regression model

Question 1:(2 pts.) Recall that the variance inflation factor foris defined as. Explain in one sentence whatis. Explain in one sentence why it is better to use VIFs than pairwise correlations when trying to detect the presence of multicollinearity in a regression data set.

Question 2:(2 pts.) For variable selection criteria based on residuals, among,,,, and, which are "good" criteria for variable selection? Explain your reason in two sentences.