Debbie is interested in determining if time of day affects how hard people exercise. To do this she asks 20 of her fellow psychology students to help. Half ride an exercise bike in the morning, and half in the evening. They report their results back to her. In this example, what is the independent variable? a) The time of day assigned to exercise
BHow long someone spent exercising
CType of exercise
DHow many students are in the class
What is the only form of psychological research that can determine cause and effect?
