Question: QUESTION: Part (b) will be posted in the comments ( Its a answer first, see next question after) A study of 420,020 cell phone users

QUESTION: Part (b) will be posted in the comments

( Its a answer first, see next question after)

A study of 420,020 cell phone users found that 140 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 0.0315% for those not using cell phones. Complete parts (a) and (b). a. Use the sample data to construct a 90% condence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. D%

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