Medical researcher, Corey Flex, is investigating the claim that consumption of steroids increases a person’s strength. Twenty-two weight-lifting addicts are recruited to participate in the study. To assess their current strength, all subjects are asked to bench press as much weight as they can. Ten of these addicts are given high doses of steroids and asked to continue to lift weights as they always had. The other 12 addicts are given sugar pills but told that they are steroids and asked to lift as they always had. After six months another bench press competition is held. The steroid group has an average gain of 140% in maximum bench press with a standard deviation of 65 percent. The sugar pill group has an average gain of 95% with a standard deviation of 110 percent. Present a hypothesis, a null hypothesis, and evaluate them.
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