Can somebody explain me how to test whether simple slopes are significant? ...and is it necessary to test the significance of the simple slopes or would it be sufficient to plot the slopes and describe the effects?
I performed a moderation analysis with a regression, i.e. a regression with an interaction. The interaction is significant. I calculated the simple slopes for different Levels of the moderator, mean + / - 1 SD. But I do not know how I can test whether These slopes are significant.