study of 420,005 cell phone users found that 137 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 0.0415% for those not using cell phones. Complete parts (a) and (b). a) Use the sample data to construct a 95% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. _%

Suppose an insurance company randomly surveyed 633 drivers and found that 601 claimed they always buckled up. Construct a 94% confidence interval for the fraction of all drivers who buckle up. p' = NR dje = Margin of Error: E = We are 94% confident that the fraction of drivers who always buckle up is between and

A poll reported that only 1316 out of a total of 1746 adults in a particular region said they had a​ "great deal of​ confidence" or​ "quite a lot of​ confidence" in the military. Assume the conditions for using the CLT are met. Complete part​ (a)  (a) Find a 95​% confidence interval for the proportion that express a great deal of confidence or quite a lot of confidence in the​ military, and interpret this interval. The 95​% confidence interval for the proportion that express a great deal of confidence or quite a lot of confidence in the military is: (  ? ,  ? )

A random sample of high school seniors were asked whether they were applying for college. The resulting confidence interval for the proportion of students applying for college is (0.65,0.69). What is the margin of error?