Dr Morimoto Is Curious as to Whether Exposing People to Violent

Multiple Choice

Dr. Morimoto is curious as to whether exposing people to violent video games causes them to be more aggressive. He assigns half his participants to play a video game for 5 minutes and the other half to play for 7 minutes. He finds that there is no relationship between playing the game longer and being more aggressive. What might be to blame for this null effect?

A) A weak manipulation
B) An insensitive measure
C) A reverse confound
D) Ceiling effect