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Question: An herb for depression? Does the herb SaintJohn's-wort relieve major depression? Here is an excerpt from the report of a study of this issue: "Design: Randomized, Double-Blind, PlaceboControlled Clinical Trial." The study concluded that the difference in effectiveness of Saint-John'swort and a placebo was not statistically significant.

(a) How did the design of this experiment account for the placebo effect?

(b) Explain the purpose of the random assignment.

(d) Explain what "not statistically significant" means in this context.

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