Question: With reference to the quit -smoking experiment: (a) Suppose the placebo trials were ignored and you were only told that 120 of 216 were abstinent

With reference to the quit -smoking experiment:
(a) Suppose the placebo trials were ignored and you were only told that 120 of 216 were abstinent after using the medicated patches. Would this now appear to be stronger evidence in favor of the patches?
(b) Explain why the placebo trials provide a more valid reference
for results of the medicated patch trials.

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