Chapter 13, Problem 36CE

Note: Exercises marked * are based on optional material.

Instructions for Data Sets: Choose one of the data sets A–K below or as assigned by your instructor. Only the first three and last three observations are shown for each data set. In each data set, the dependent variable (response) is the first variable. Choose the independent variables (predictors) as you judge appropriate. Use a spreadsheet or a statistical package (e.g., MegaStat or Minitab) to perform the necessary regression calculations and to obtain the required graphs. Write a concise report answering questions 13.25 through 13.41 (or a subset of these questions assigned by your instructor). Label sections of your report to correspond to the questions. Insert tables and graphs in your report as appropriate. You may work with a partner if your instructor allows it.

(a) If you did not already do so, rerun the regression requesting variance inflation factors (VIFs) for your predictors. (b) Do the VIFs suggest that multicollinearity is a problem? Explain.