The Cp statistic is used
A) to determine if there is an irregular component in a time series.
B) to choose the best model.
C) to determine if there is a problem of collinearity.
D) if the variances of the error terms are all the same in a regression model.
Question 2
The Variance Inflationary Factor (VIF) measures the
A) standard deviation of the slope.
B) correlation of the X variables with each other.
C) contribution of each X variable with the Y variable after all other X variables are included in the model.
D) correlation of the X variables with the Y variable.
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