A researcher who finds that males have significantly higher levels of arousal watching horror films in the presence of the opposite sex (vs. watching alone) while females have no change in arousal levels with or without opposite sex companions has found a(n):
A) Main effect for sex of viewer
B) Main effect for presence vs. absence of opposite-sex companion viewer
C) Interaction effect
D) Confounding variable

Question

Quizplus · Accepted Answer

The researcher has found an interaction effect because the effect of the presence of an opposite-sex companion on arousal levels differs between males and females.

A Researcher Who Finds That Males Have Significantly Higher Levels