SOLUTION: A study of 420,065 cell phone users found that 136 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was fo
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Question 1182743: A study of 420,065 cell phone users found that 136 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 0.0316% for those not using cell phones.
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.
__% < p < __%
(Round to three decimal places as needed.)
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
The 95% half-interval is z(0.975)*sqrt(p*(1-p)/n)
=1.96*sqrt(0.000316*0.999684/420065)
=0.0000274; add that and subtract it from 0.000323, p hat.
so the interval is (0.000296, 0.000350)
or (0.030%, 0.0350%)
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