SOLUTION: A study of 420,100 cell phone users found that 134 of them developed cancer of the brain or nervous system. Prior to the study of cell phone use, the rate of such cancer was found
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Question 1148734: A study of 420,100 cell phone users found that 134 of them developed cancer of the brain or nervous system. Prior to the study of cell phone use, the rate of such cancer was found to be 0.0342% for those not using cell phones. 95% confidence interval Answer by Boreal(15235) (Show Source):
You can put this solution on YOUR website! 134/420,100=0.0003190=0.03190%
95%CI half-interval is z*sqrt(p*(1-p))/n
=1.96* sqrt(0.000319*0.999681)/420,100
=0.000054
so CI is (0.000265%, 0.000373%)
