Fewer young people are driving. In 1983, 87% of 19-yearolds had a driver's license. Twenty-ve years later that percentage had dropped to 75% (University of Michigan Transportation Research Institute website, April 7, 2012). Suppose these results are based on a random sample of 1200 19-year-olds in 1983 and again in 2008. a. At 95% condence, what is the margin of error and the interval estimate of the number of 19-yearold drivers in 1983? Round your intermediate answers to four decimal places. Margin of error 2 (four decimal places) Interval estimate (to four decimal places) = to b. At 95% confidence, what is the margin of error and the interval estimate of the number of 19-yearold drivers in 2008? Round your answers to four decimal places. Margin of error = Interval estimate 2 to