Summer 2014 Final Exam with SAS and R Output for Part
Part A
1. b 2. b 3. c 4. a 5. c 6. a
7. c 8. b 9. d 10. d 11. c 12. a
13. b 14. a 15. b 16. d 17. b 18. d
19. b 20. a 21. b 22. d 23. d 24. - 25. -
Part B
1. Best model is Model 3
because it has highest adjusted R^2 value 0.6939.
Residuals are unbiased and homoscedastic.
vifs are <= 2.09, so no multicollinarity problem.
Model 3 has these influence points:
Observations 6 and 12 have studentized resids close to -2 and 2
Observations 24 and 26 have hii above cutoff of 2p/n = 2*4/30 = 0.267
2. yhat = 13.58 + 0.623 * 60 + 0*58 + 0.313 * 60 + 0.187 * 40
= 77.22