In a double-blinded clinical trial concerning the treatment of arthritis, half of the patients received a nonsteroidal anti-inflammatory agent and the other half received an inert substance. Two-thirds of the patients in the first group and one-third of the patients in the second group reported relief of symptoms. The patients’ reports of improvements after being treated with the inert substance are best described as what kind of effect?
[Verified Answer]: In a double-blinded clinical trial…
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