Lab 5: Understanding Interaction in Regression Analyze Regression Linear predicting Dependent Independent both iV's & interaction term An interaction exists when the relationship between two variables is different for different levels of a third variable. Consider as an example, in our data, men and women do not differ on handedness (r = .05, p = .08) or their ability to mentally rotate objects (1': -.03, p = .36). In addition, student's handedness appears unrelated to the ability to mentally rotate objects (r: .00, p = .94). However, it turns out that handedness is related to the ability to mentally rotate objects, but men and women are signicantly different in that relationship (8 = -.49, p