WithanInternetsearch,findastudythatusedan (a) experiment; (b) observational study.Ineachcase,describehowthesamplewasobtainedandsummarizeresults.

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WithanInternetsearch,findastudythatusedan

(a) experiment;

(b) observational study.Ineachcase,describehowthesamplewasobtainedandsummarizeresults.

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