Fewer young people are driving. In 1983, 87% of 19 -year-olds had a driver's license. Twenty-five 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% confidence, what is the margin of error and the interval estimate of the number of 19 -year-old drivers in 1983? Round your intermediate answers to four decimal places. Margin of error (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 -year-old drivers in 2008? Round your answers to four decimal places. Margin of error Interval estimate to
Fewer young people are driving. In 1983, 87% of 19 -year-olds had a driver's license. Twenty-five 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% confidence, what is the margin of error and the
Margin of error (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 -year-old drivers in 2008? Round your answers to four decimal places.
Margin of error
Interval estimate to
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