41.
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 num-
ber of 19-year-old drivers in 1983?
b. At 95% confidence, what is the margin of error and the interval estimate of the num-
ber of 19-year-old drivers in 2008?
C. Is the margin of error the same in parts (a) and (b) ? Why or why not?
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