Description:

In your homework, NUMBER each of the following sections as they are numbered below.

PAGE 1
1. Write in words an example of a two-factor experimental design.
2. Give it a title.
3. What is IV#1?
4. What is IV#2?
5. What is the DV?
NOTE 1: Use your example in all of the remaining parts of this assignment.
NOTE 2: All of this assignment may be hand-written. There is no need to use the computer unless you want to.

PAGE 2
Write on top of this page: main effect of factor 1 and no effect of factor 2.
6. write a 2x2 table that shows a main effect of factor 1 but no effect of factor 2 (and no interaction).
- be sure to label your axes!
7. draw the graph for that table.
- be sure to label your axes!
- under the table, write EITHER: "lines are parallel, so no interaction" OR "lines are not parallel, so there is an interaction."

PAGE 3
Write on top of this page: main effect of factor 2 and no effect of factor 1.
8. write a 2x2 table that shows a main effect of factor 2 but no effect of factor 1 (and no interaction)
- be sure to label your axes!
9. draw the graph for that table.
- be sure to label your axes.
- under the table, write EITHER: "lines are parallel, so no interaction" OR "lines are not parallel, so there is an interaction."

PAGE 4
Write on top of this page: main effect of factor 1 and also main effect of factor 2, but no interaction.
10. write a 2x2 table that shows a main effect of both factor 1 and factor 2, but no interaction
- be sure to label your axes!
11. draw the graph for that table.
- be sure to label your axes.
- under the table, write EITHER: "lines are parallel, so no interaction" OR "lines are not parallel, so there is an interaction."

PAGE 5
Write on top of this page: example of an interaction.
12. write a 2x2 table that shows an interaction.
13. draw the graph for that table.
- be sure to label your axes.
- under the table, write EITHER: "lines are parallel, so no interaction" OR "lines are not parallel, so there is an interaction."
14. at the bottom of the page, state whether your example shows a main effect for factor 1, and also whether your example shows a main effect for factor 2.

OPTIONAL:

To be sure you fully understand these concepts, you may wish to give additional examples of interactions. On page 5 (above) you were asked to give an example of an interaction, but I did not say anything about whether there should be main effects or not. You might try to give examples of interactions in which there is a main effect of factor 1 but not factor 2, OR a main effect of factor 2 but not factor 1, OR a main effect of each factor (but with interactions in all cases). For the final exam, you will not need to be able to produce such examples, but you will need to be able to recognize them when they are shown to you.