This is an Interaction Plot showing the mean years of survival after treatment f

Question

This is an Interaction Plot showing the mean years of survival after treatment for lung cancer, with treatment levels 1 and 2 among men and women. In the plot, "Score" refers to the mean years of survival. Choose the best interpretation of effects. Two main effects and no interaction effect No main effects and no interaction effect One main effect and one interaction effect Two main effects and one interaction effect No main effects and one interaction effect One main effect and no interaction effect

Explanation / Answer

There is no main effect but there is one interaction effect

Because

The lines are not parallel, so there is likely to be an interaction.

Because the lines intersect, this type of interaction is sometimes called a cross-over interaction.

It appears that the two blue circles are not higher or lower than the two red circles, so there is no main effect.

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