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A study of 420,095 cell phone users found that 0.0312% of them developed cancer of the brain or nervous system. Prior to this study of

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A study of 420,095 cell phone users found that 0.0312% of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0312% for those not using cell phones. Complete parts (a) and (b). a. Use the sample data to construct a 95% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. 1%

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