Tom and jesse decided to perform an experiment to see what exercise does to blood pressure. they decided to test their friend john. below is their procedure.1. take test subject's resting blood pressure.2. have test subject do either sit ups, push ups, or sprint for one minute.3. take test subject's blood pressure. tom and jesse run the same tests on john every day for one week. running the same test, for one week, is an example ofa) validity. b) a control. c) repetition. d) replication.