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[All Steps] In a randomized double-blind, placebo-controlled trial of children, echinacea was tested as a treatment for upper respiratory infections in

Question: In a randomized double-blind, placebo-controlled trial of children, echinacea was tested as a treatment for upper respiratory infections in children. "Days of fever" was one criterion used to measure effects. Among 337 children treated with echinacea, the mean number of days with fever was 0.81, with a standard deviation of 1.50 days. Among 370 children given a placebo, the mean number of days with fever was 0.64 with a standard deviation of 1.16 days. Use a 0.05 significance level to test the claim that echinacea affects the number of daus with fever.

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