A study of 420,058 cell phone users found that 0.0309​% 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 0.0323​% 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 developed cancer of the brain or nervous system.
__% < p < __%
​(Do not round until the final answer. Then round to three decimal places as​ needed.)
B)These 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?