Chapter 11:

Factorial Experiments

A. How one experiment can do as much as two

B. How one experiment can do more than two

1. Four simple main effects

2. Two overall main effects

3. Interactions

4. Example of questions addressed by a 2 X 2 experiment

C. Potential results of a 2 x 2 experiment

1. Main effect and no interaction

2. Two main effects and no interaction

3. Two main effects and an interaction

4. Interaction without main effects

5. One main effect and an interaction

6. No main effects and no interaction

II. Analyzing the results from a 2 x 2 experiment

A. Interpreting results of an ANOVA table

1. Main effects without interactions

B. Interactions

1. Ceiling effects

2. Floor effects

III. Putting the 2 x 2 to work

A. Adding a replication factor to increase

generalizability

B. Using an interaction to find an exception to the rule

C. Using interactions to create new rules

D. Using interactions to pinpoint what you are manipulating

E. Studying non-experimental variables

1. Increasing generalizability

2. Studying effects of similarity

3. Finding an exception to the rule

IV. Concluding remarks

Summary

Key terms and Issues

Exercises

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