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

Multiple Choice

If the means for a two-factor study are displayed in a graph and the lines in the graph are perfectly parallel,then 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.