If a between-subjects study explores the effect of caffeine on appetite by comparing the appetites of teenagers with no caffeine in their systems with middle-aged adults with 100 mg of caffeine in their system, the study is ________.
A) fatigued
B) confounded
C) demoralized
D) statistically significant

Question

Quizplus · Accepted Answer

The study is confounded, as the effect of caffeine cannot be isolated from the effects of age and other demographic variables. This means that we cannot confidently conclude that any differences in appetite are solely due to caffeine, as age could also be contributing to the results.

If a Between-Subjects Study Explores the Effect of Caffeine on Appetite