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Dr Smith Wishes to Compare Three Widely Used Sleeping Pills

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Dr. Smith wishes to compare three widely used sleeping pills with regard to possible "hangover" effects. Twelve volunteers are given a problem-solving test at 9:00 a.m. after having been administered the standard recommended dose of one of the preparations (according to random assignment) the night before. The results are given below.
Dr. Smith wishes to compare three widely used sleeping pills with regard to possible hangover effects. Twelve volunteers are given a problem-solving test at 9:00 a.m. after having been administered the standard recommended dose of one of the preparations (according to random assignment) the night before. The results are given below.

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