You conduct an experiment on twenty 18-year-old male subjects to see how various intensities of exercise influence heart rate.Which of the following is/are considered an independent variable?
A) age of subjects
B) sex of subjects
C) intensity of exercise
D) heart rate
E) More than one of the answers is correct.

Question

Quizplus · Accepted Answer

The independent variable is the variable that is manipulated or changed by the researcher. In this experiment, the intensity of exercise is being changed by the researcher, making it the independent variable. Age and sex are not being manipulated, and heart rate is the dependent variable that is being measured in response to the different intensities of exercise.

You Conduct an Experiment on Twenty 18-Year-Old Male Subjects to See