Dr. Jones is interested in studying the effect of the number of bystanders present at an emergency on the number of subjects who help the victim. She varies the number of bystanders (1, 3, or 5) and records how many subjects help under each condition. In this example, the number of bystanders is the _____ variable.
A) dependent
B) extraneous
C) correlational
D) independent

Question

Quizplus · Accepted Answer

The number of bystanders is the independent variable because it is the factor that Dr. Jones manipulates to observe its effect on the number of subjects who help, which is the dependent variable.

Dr Jones Is Interested in Studying the Effect of the Number