Review of Main Effects, Interactions, and Reading Tables
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1. In a 2 X 2 experiment, a main effect can be estimated by.
-- Choose an answer --
a. Adding its two simple main effects
b. Subtracting its two simple main effects
c. Averaging its two simple main effects
d. You can't estimate main effects from simple main effects
2. An interaction occurs when
-- Choose an answer --
a. The combined effect of two treatments is less than adding the individual effects of both treatments
b. The combined effect of two treatments is greater than adding the individual effects of both treatments
c. The combined effect of two treatments is opposite of what would be expected from adding the individual effects of both treatments
d. All of the above are examples of interactions
3. What does the table of means below suggest in terms of main effects and interactions?
A1
A2
B1
8
4
B2
6
6
-- Choose an answer --
a. One main effect and no interaction
b. One main effect and an interaction
c. Two main effects and an interaction
d.Two main effects but no interaction
4. What does the table of means below suggest in terms of main effects and interactions?
A1
A2
B1
2
4
B2
5
7
-- Choose an answer --
a. No main effect and no interaction
b. One main effect and an interaction
c. Two main effects and an interaction
d.Two main effects but no interaction
5. What does the table of means below suggest in terms of main effects and interactions?
A1
A2
B1
50
80
B2
70
40
-- Choose an answer --
a. Only an A main effect
b. Only a B main effect
c. an A and B main effect
d. a B main effect and an A X B interaction
6. What is it called when the independent variable has one kind of effect in the presence of one level of a second independent variable, but a different kind of effect in the presence of a different level of the second independent variable?
-- Choose an answer --
a. a main effect
b. a crossover interaction
c. an ordinal interaction
d. two main effects
7. What is it called when the independent variable seems to have more of an effect in the presence of one level of a second independent variable than in the presence of a different level of the second independent variable?
-- Choose an answer --
a. a main effect
b. a crossover interaction
c. an ordinal interaction
d. two main effects
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