A study of the effectiveness of echinacea involved 707 cases of upper respiratory tract infections. Children with
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A study of the effectiveness of echinacea involved 707 cases of upper respiratory tract infections. Children with 337 of the infections were given echinacea, and children with 370 of the infections were given placebos (based on data from “Efficacy and Safety of Echinacea in Treating Upper Respiratory Tract Infections in Children,” by Taylor et al., Journal of the American Medical Association, Vol. 290, No. 21).
Determine whether the given description corresponds to an observational study or an experiment.
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