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 . 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
b) how long someone spent exercising
c) type of exercise
d) how many students are in the class

what is the only form of psychological research that can determine cause and effect?

a) comparative study
b) correlational study
c) survey
d) experiment