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A study of 420 comma 042 cell phone users found that 133 of them developed cancer...

A study of 420 comma 042 cell phone users found that 133 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 0.0313​% 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.

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