A researcher wanted to test the effect that riding the subway has on mental health. She formed two groups of subjects, an experi- mental group and a control group. The experimental group rode the subway for 60 minutes every morning. The control group jogged for an equal period of time. At the end of one month, both groups were measured on a scale of adjustment and well-being. The control group was found to be better adjusted than the experimental group. Do you accept the conclusion that riding the subway damages mental health? Why or why not?