a study of 420090 cellphones users found that 132 of them de

a study of 420,090 cellphones users found that 132 of them developed cancer of the brain or nervous system. prior to this study of cellphone use the rate of such cancer was found to be 0.0346% for those not using cellphones. compelete (a) and (b)

A) ___% < p > ___%

B) do cell phone users appear to have a rate of cancer of the brain or nervous system that is different from the rate of such cancer among those not using cellphones? why or why not?

Solution

a)
Confidence Interval For Proportion
CI = p