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15 June, 01:14

In an experiment to determine the effect of exercise on pulse rate, a student checks his pulse rate before

and after exercising for several minutes. The purpose of checking his pulse rate before exercising is that it

(1) serves as the conclusion for the experiment

(2) is needed to justify the sample size

(3) serves as a control for the experiment

(4) is needed to formulate a hypothesis

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Answers (1)
  1. 15 June, 01:55
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    3. It serves as the control for the experiment. If he only checks his pulse rate after exercising th en there is no comparison to show whether th rate has increased, decreased, or remained unchanged.
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