When the means for a two-factor study are displayed in a graph and the lines in the graph are perfectly parallel, what can you conclude about the main effects and interaction?
A) There is no main effect for either of the two factors.
B) There is a main effect for both of the two factors.
C) There is no interaction between factors.
D) There are no main effects and no interaction between factors.

Question

Quizplus · Accepted Answer

When the lines in the graph for a two-factor study are perfectly parallel, it indicates that there is no interaction between the two factors. It does not provide information about the presence of main effects.

When the Means for a Two-Factor Study Are Displayed in a Graph