A study of 420 comma 059 cell phone users found that 130 of themdeveloped cancer of the brain or nervous system. Prior to thisstudy of cell phone​ use, the rate of such cancer was found to be0.0438​% for those not using cell phones. Complete parts​ (a) and​(b). a. Use the sample data to construct a 90​% confidence intervalestimate of the percentage of cell phone users who develop cancerof the brain or nervous system.
2. Use the sample data and confidence level given below tocomplete parts​ (a) through​ (d). A research institute poll askedrespondents if they felt vulnerable to identity theft. In the​poll, n equals 934 and x equals 524 who said​ \"yes.\" Use a 95 %confidence level. ​b) Identify the value of the margin of errorE.
