A researcher studies the effect of exercise on stamina.Participants are randomly assigned to be in an exercise or no-exercise group for 12 weeks.Stamina is then measured by how long participants can walk comfortably on a treadmill.In this study, the dependent variable is:

Question

Quizplus · Accepted Answer

The dependent variable is the variable that is being measured and observed in the study. In this case, it is the stamina of the participants, which is measured in terms of the number of minutes they can walk comfortably on the treadmill. Therefore, the correct answer is A. B is incorrect because it is the independent variable, which is manipulated or controlled by the researcher. C and D are incorrect because they are not the variables being measured in the study, but rather the duration of the exercise program and heart rate, respectively.

A Researcher Studies the Effect of Exercise on Stamina