DrSanderson Is Curious as to Whether Exposing People to Violent

Multiple Choice

Dr.Sanderson is curious as to whether exposing people to violent video games causes them to be more aggressive.She assigns half her participants to play a violent video game for 5 minutes and the other half to play the same game for 25 minutes.Afterward,she has them play a board game and has a well-trained coder determine whether they are very aggressive in their playing style,barely aggressive,or not at all aggressive.She finds that a vast majority of her participants,regardless of group assignment,are rated as very aggressive.This outcome would be known as a/an:

A) Weak manipulation
B) Ceiling effect
C) Floor effect
D) Outlier
E) Large within-group variance