A Researcher Discovers That Extroverts Solve Problems Better Than Introverts

Multiple Choice

A researcher discovers that extroverts solve problems better than introverts when in a large room, but that introverts do better than extroverts in a small room. Which of the following is true?

A) this outcome describes a main effect for room size
B) this outcome describes a main effect for personality type
C) this outcome describes a person by environment (P x E) interaction
D) in this study, there were two main effects (room size and personality type) but no interaction