In a study of HIV infection among women entering the New York state prison system, 475...

 

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In a study of HIV infection among women entering the New York state prison system, 475 inmates were cross-classified with respect to HIV seropositivity and their histories of intravenous drug use. These data are stored in a dataset called prison. The indicators of seropositivity are saved under the variable hiv (0-positive, 1-negative) and those of drug use under ivdu (0-drug use, 1=no drug use). Intravenously Used Drugs Have Not Intravenously Used Drugs Total HIV Positive HIV Negative 61 75 27 312 88 387 Total 136 339 475 a) Among women who have used drugs intravenously, what proportion are HIV positive? Among women who have not used drugs intravenously, what proportion are HIV positive? b) Use Excel, at 0.05 level of significance, test the null hypothesis that there is no association between history of intravenous drug use and HIV seropositivity. What do you conclude (relate to the scenario)? c) Use Excel, estimate the odds ratio and the 95% confidence interval of being HIV positive for women how have used drugs intravenously versus those who have not, and interpret these numbers in this scenario. In a study of HIV infection among women entering the New York state prison system, 475 inmates were cross-classified with respect to HIV seropositivity and their histories of intravenous drug use. These data are stored in a dataset called prison. The indicators of seropositivity are saved under the variable hiv (0-positive, 1-negative) and those of drug use under ivdu (0-drug use, 1=no drug use). Intravenously Used Drugs Have Not Intravenously Used Drugs Total HIV Positive HIV Negative 61 75 27 312 88 387 Total 136 339 475 a) Among women who have used drugs intravenously, what proportion are HIV positive? Among women who have not used drugs intravenously, what proportion are HIV positive? b) Use Excel, at 0.05 level of significance, test the null hypothesis that there is no association between history of intravenous drug use and HIV seropositivity. What do you conclude (relate to the scenario)? c) Use Excel, estimate the odds ratio and the 95% confidence interval of being HIV positive for women how have used drugs intravenously versus those who have not, and interpret these numbers in this scenario.

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B17 1 2 Used Drug 3 Not used 4 Total 5 50 A 6 7 ... View the full answer