Question

A study of 420,010 cell phone users found that 130 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 0.0418​% for those not using cell phones. Complete parts​ (a) and​ (b).

a. Use the sample data to construct a 90% 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.)

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 cell​ phones? Why or why​ not?

A. Yes​, because 0.0418 is included in the confidence interval.

B. No​, because 0.0418% is included in the confidence interval.

C. No​, because 0.0418% is not included in the confidence interval.

D. Yes​, because 0.0418% is not included in the confidence interval.

Answer 1