If the means from a 2 x 2 study are displayed in a graph and the lines on the graph are perfectly parallel,then what can you conclude?
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 is an interaction between factors

Question

Quizplus · Accepted Answer

If the lines on the graph are perfectly parallel, it means that there is no interaction between factors. However, this does not provide information about whether there is a main effect for either factor. It is possible for there to be a main effect even if the lines are perfectly parallel. Therefore, options A and B cannot be concluded based solely on the parallelism of lines.

If the Means from a 2 X 2 Study Are