Is Echinacea Effective for Colds? Rhino viruses typically cause common colds. In a test of the…

Is Echinacea Effective for Colds? Rhino viruses typically cause common colds. In a test of the…

Is Echinacea Effective for Colds? Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea, 40 of the 45 subjects treated with echinacea developed rhinovirus infections. In a placebo group, 88 of the 103 subjects developed rhinovirus infections (based on data from “An Evaluation of Echinacea Angustifolia in Experimental Rhinovirus Infections,” by Turner, et al., New England Journal of Medicine, Vol. 353, No. 4). Construct a 95% confidence interval estimate of the difference between the two rates of infection. Does echinacea appear to have any effect on the infection rate?

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