A study of 420067 cell phone users found that 133 of them de

A study of 420,067 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 .0316 % for those not using cell phone. Complete parts (a) and (b). 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. 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 cell phones? Why or why not?

Solution

Sample Size: 420067
Observed Proportion: 0.031512%
Confidence Level: 95%

Margin of error = ±0.01

Confidence interval = 0.03% to 0.04%

----------------------

No because 0.0316 is included in the CI

Option A