19. ADVANCED TOPIC: Do the following for the scores in practice problems (a)

16,

(b) 17, and

(c) 18: (i) Figure the analysis of variance using the structural model approach from “Introduction to the Analysis of Variance”; (ii) figure the proportionate reduction in error based on the analysis of variance results; (iii)

carry out a regression analysis (predicting the measured variable score from the group that participants are in); (iv) figure the proportionate reduction in error using the long method of figuring predicted scores, and finding the average squared error using them; and (v) make a chart showing the parallels in the results.