Sally found that neither caffeine nor extraversion individually predicted problem solving; however, she found that they both worked together to predict problem solving. This is an example of what kind of an effect?
A) a true interaction
B) a suppressor
C) an evocation
D) a true mediation

Question

Quizplus · Accepted Answer

This is an example of a true interaction effect, where the effect of one variable (e.g., caffeine) on an outcome (e.g., problem solving) depends on the level of another variable (e.g., extraversion). In this case, neither variable alone predicts problem solving, but together they do, indicating their effects interact with each other.

Sally Found That Neither Caffeine nor Extraversion Individually Predicted Problem