2
COMPARING GROUPS
Comparing Groups
D8.9.6 – In Output 9.6 (a) Describe the F, df, and p values for each dependent variable as
you would in an article.
There are
(b) Describe the results in nontechnical terms for visualization and grades. Use the group
means in your description.
Another
D8.9.7 – In Outputs 9.7 a and b, what pairs of means were significantly different?
The output
D8.9.8 In Output 9.8, interpret the meaning of the sig. values for math achievement and
competence. What would you conclude, based on this information, about differences
between groups on each of these variables?
When
D8.9.9 Compare Outputs 9.6 and 9.8 with regard to math achievement. What are the most
important differences and similarities?
In
D8.9.10 In Output 9.9: (a) Is the interaction significant?
In
3
COMPARING GROUPS
(b) Examine the profile plot of the cell means that illustrates the interaction. Describe it in
words.
In interpreting
(c) Is the main effect of academic track significant? Interpret the eta squared.
The
(d) How about the “effect” of math grades?
If r was
(e) Why did we put the word effect in quotes?
If r was
(f) Under what conditions would focusing on the main effects be misleading?
The Wilcoxon
