A study of 420,100 cell phone users found that 136 of them developed cancer of the brain or nervous system Prior to his study of cell phone use, the rate of such cancer was found to be 0.0329% for those not using cell phones. Complete parts (a) and ) a. Use the sample data to construct a 95% confidence interval estimate of the percentage cf cell phone users who develop cancer of the brain or mervous system (Round to three decimal places as needed) b. Do cell phoe users appear to have a rate of cancer of the brain or nervous system that is difierent trom the rate of such cancer ameng those mot using cell phones? Why or why not A Yes, because 0 0329% is included in the confidence interval OB. No, because 0 0329% is not included in the confidence intervail OC Yes, because 00329% is not included in the confidence intervail OD. No, because 0 0329% is included in the confidence interval.

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