The caffeine/exercise group scores higher than either than caffeine/no-exercise group or the no-caffeine/no exercise group.This could be due to:
A) main effects for both caffeine and exercise
B) an interaction between caffeine and exercise
C) both a and b
D) neither a nor b

Question

Quizplus · Accepted Answer

The higher scores in the caffeine/exercise group could be due to main effects of both caffeine and exercise individually improving performance, as well as a potential interaction effect where the combination of caffeine and exercise leads to even greater improvement than either factor alone.

The Caffeine/exercise Group Scores Higher Than Either Than Caffeine/no-Exercise Group