Question

Students were asked to determine if they could squeeze a clothespin more times in a minute after resting than after exercising. An experiment that accurately tests this question should include all of the following except a a large number of students b two sets of clothespins, one that is easy to open and one that is more difficult to open c a control group and an experimental group with equal numbers of students of approximately the same age d a hypothesis on which to base the design of the experiment

Answer 1

You do not need b. two sets of clothespins, one that is easy to open and one that is more difficult to open

This has no relevance if you want to test whether or not you can squeeze more in a minute. You only need one set of clothespins for this.