Subjects are assigned to take math tests in either a crowded classroom or an almost-empty classroom. Test scores are then examined to determine whether these conditions affected performance. In this example, the independent variable is
A) the test scores.
B) the subjects' mathematics skill.
C) not identified.
D) how crowded the classroom was.

Question

Quizplus · Accepted Answer

The independent variable is the variable that is manipulated or changed by the researcher in the study. In this case, the independent variable is how crowded the classroom was, as it is the variable that is being manipulated to see if it has an effect on test scores. The other options (test scores, mathematics skill, and not identified) are not the independent variable in this study.

Subjects Are Assigned to Take Math Tests in Either a Crowded