A comprehensive trial investigating the relationship between vitamin E supplementation and reduced risk for prostate cancer was carried out across the US. Suppose the trial reported that among the 648 patients receiving the supplement program, 267 developed prostate cancer, while only 212 of the 711 patients without the supplementation developed the disease.    Calculate a risk difference between the two groups for developing prostate cancer and construct a 95% confidence interval for your estimate calculated.

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A comprehensive trial investigating the relationship between vitamin E supplementation and reduced risk for prostate cancer was carried out across the US. Suppose the trial reported that among the 648 patients receiving the supplement program, 267 developed prostate cancer, while only 212 of the 711 patients without the supplementation developed the disease. 

 

Calculate a risk difference between the two groups for developing prostate cancer and construct a 95% confidence interval for your estimate calculated.

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