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Score: 0 of1 pt ' 4 b ' HW Score: 76.84%, 14.6 of19 pts 7.1.23 E5 Question Help O- A study of 420,009 cell phone users found that 131 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 0.0433% for those not using cell phones. Complete parts (a) and (b). 3. Use the sample data to construct a 95% condence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. %