Dr. Jones has individuals run on a treadmill for 0, 15, or 30 minutes and then measures their self-reported mood. In this hypothetical study, the independent variable is the __________.
A) self-reported mood
B) individuals who run for 15 or 30 minutes
C) individuals who run for 0 minutes
D) number of minutes individuals run on the treadmill

Question

Quizplus · Accepted Answer

The independent variable is the variable that is manipulated by the researcher in order to see its effect on the dependent variable. In this study, the independent variable is the number of minutes individuals run on the treadmill, as this is what Dr. Jones is manipulating to see its effect on self-reported mood. Therefore, the correct answer is D.

Dr Jones Has Individuals Run on a Treadmill for 0