Consider a factorial ANOVA in which the dependent variable is reaction time scores. Three different drugs are tested on both females and males. The researchers concluded that the effect of a drug did not depend on whether the person taking it was a female or male. The factorial ANOVA would certainly show that
A) there is no main effect for drug
B) there is no main effect for gender
C) there is no interaction
D) all of the other alternatives are correct.

Question

Quizplus · Accepted Answer

The conclusion that the effect of a drug did not depend on whether the person taking it was a female or male directly indicates that there is no interaction between the drug and gender factors in the factorial ANOVA. This means the effect of one factor (drug) does not change across the levels of the other factor (gender).

Consider a Factorial ANOVA in Which the Dependent Variable Is