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

True Interaction

An authentic exchange or engagement between people, which is genuine and not artificial or simulated in any way.

Suppressor Effect

A statistical phenomenon where a variable increases the predictive validity of another variable by controlling for or suppressing irrelevant variance.

Evocation

The act of bringing something into the mind or consciousness, often used in the context of emotions or memories.