Not saying that I agree or disagree with the hypothesis, but it does assume that all other variables remain the same. By moving to a different area with more s

Not saying that I agree or disagree with the hypothesis, but it does assume that all other variables remain the same. By moving to a different area with more stuff to do, you invalidate the experiment. That's akin to saying exercising everyday for an hour did not improve your health because you got hit by a car one day while running.