Twenty sprint cyclists were randomly selected to be in a study designed to test the effectiveness of 12 weeks of creatine supplementation on performance. Ten cyclists received a creatine supplement for three months while the other ten received a placebo. The cyclists did not know which supplement they were taking, while the researcher did have this information. The study was a(n)____ study.

Question

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The study is randomized because the cyclists were randomly assigned to either the creatine or placebo group. It is not double-blind because the researcher knew which supplement each cyclist was taking.

Twenty Sprint Cyclists Were Randomly Selected to Be in a Study