For each description below, indicate which type of effect is being tested (main effect or interaction): a. Three groups of subjects are exposed to three different types of stories to compare the...

For each description below, indicate which type of effect is being tested (main effect or interaction):

a. Three groups of subjects are exposed to three different types of stories to compare the effect of type of story on reading speed.

b. Researchers examine whether the effect of note-taking method (by hand or on a computer) on test score depends on the type of class a student is taking.

c. A study tested the effects of both room color and presence/absence of plants on recovery time in a hospital. The individual effects of room color and presence/absence of plants were tested.