Do you use cocaine? Sample surveys on sensitive issues can give differentresults
Chapter 0, Problem 23.32(choose chapter or problem)
Do you use cocaine? Sample surveys on sensitive issues can give differentresults depending on how the question is asked. A University of Wisconsin studydivided 2400 respondents into 3 groups at random. All were asked if they hadever used cocaine. One group of 800 was interviewed by phone; 21% said theyhad used cocaine. Another 800 people were asked the question in a one-on-one personal interview; 25% said Yes. The remaining 800 were allowed to make ananonymous written response; 28% said Yes. 14 Are there statistically significantdifferences among these proportions? State the hypotheses, convert theinformation given into a two-way table of counts, give the test statistic and itsP-value, and state your conclusions.
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