SOLUTION: A study of 420,098 cell phone users found that 139 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 1155903: A study of 420,098 cell phone users found that 139 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 0.0206% 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.
nothing%less thanpless than
nothing%
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
p hat=0.000331
half-interval is z0.975*sqrt(p(1-p)/n), p=0.000331 and 1-p=0.999669
=1.96*sqrt(0.0000331/420098)
=0.0000281*1.96=0.055 se
add and subtract from mean
(.028%, .039%)
Since 0.0206% is not in the interval can conclude there is a difference.
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