A Crossover Interaction Occurs in a 2 X 2 Factorial

A crossover interaction occurs in a 2 x 2 factorial design when

A) the means on one dependent variable are different within a level of another dependent variable.
B) there are differences on the dependent measure across the levels of any one factor.
C) the simple effect in one level of the second variable is the same as the simple effect in the other level of the second variable.
D) the simple effects are opposite in direction.