An Interaction Effect in a Two-Way Factorial Design

Multiple Choice

An interaction effect in a two-way factorial design

A) is the effect of one variable that divides the groups,ignoring the influence of the other variable that divides the groups.
B) occurs when the influence of one variable that divides the groups changes according to the level of the other variable that divides the groups.
C) almost never occurs when more than one variable that divides the groups is considered at a time.
D) is rare in a well-designed study,and usually indicates some error in computation.