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It evaluates the relative effects of two or more treatments. A question of relative effects asks: Which treatment is more effective? An investigator randomly selects a sample from a population and randomly assigns them to one of the three groups. the

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1. It evaluates the relative effects of two or more treatments. A question of relative effects asks: Which treatment is more effective? An investigator randomly selects a sample from a population and randomly assigns them to one of the three groups. the





 
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