Which of the following explains interaction in a multiple regression model?
a. The interaction effect is always equal to zero.
b. Interaction occurs when the effect on the dependent variable of a change in one predictor, holding the other constant, depends on where that other variable is held constant.
c. Interaction always occurs when there are more than two predictors in a model.
d. Interaction occurs when two independent variables do not depend on the value of each other when determining their effect on the dependent variable.
b
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