In an interaction plot, the two factors don't interact unless the lines connecting the means of the groups cross.

Name: In an interaction plot, the two factors don't interact unless the lines connecting the means of the groups cross.
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Quizplus · Accepted Answer

In an interaction plot, the presence of interaction between two factors is suggested by non-parallel lines, not just by the lines crossing. Interaction is indicated by the degree to which the lines are not parallel, whether they cross or not.

In an Interaction Plot, the Two Factors Don't Interact Unless