Test Yourself

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1. If your experiment has four groups, it is a factorial experiment.
2. You have the following groups: Group 1 (No Treatment), Group 2 (Treatment A), Group 3 (Treatment B), and Group 4 (Treatment C). How many factors (independent variables) do you have in your experiment?
3. You have the following groups: Group 1 (No Treatment), Group 2 (Treatment A only), Group 3 (Treatment B only), and Group 4 (Treatment A and B). Do you have a factorial experiment?
4. A factorial experiment has at least two independent variables.
5. A 2 X 2 experiment yields ____ simple main effects.
6. In a factorial experiment, you could estimate the overall main effect of a treatment by _____ its simple main effects.
7. In a 2 X 2 factorial experiment, you could estimate the interaction effect by _____ a treatment´s two simple main effects.
8. You have the following means:

No Treatment A Treatment A
No Treatment B 5 10
Treatment B 15 20

Do you have?

9. Questions about external validity often involve interactions.
10. Moderating variables are variables that interact with another variable.




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