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In a clinical trial of avaccine, 12,000 children were randomly divided into two groups. The subjects in group 1(the experimentalgroup) were given the vaccine while
In a clinical trial of avaccine, 12,000 children were randomly divided into two groups. The subjects in group 1(the experimentalgroup) were given the vaccine while the subjects in group 2(the controlgroup) were given a placebo. 6,000 children in the experimentalgroup,73 developed the disease. Of 6,000 children in the controlgroup,119 developed the disease.
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