fewer young people are driving. in year a, 64.9% of people under 20 years old who were eligible had a driver's license. twenty years later in year b that percentage had dropped to 45.7%. suppose these results are based on a random sample of 1,800 people under 20 years old who were eligible to have a driver's license in year a and again in year b. (a) at 95% confidence, what is the margin of error of the number of eligible people under 20 years old who had a driver's license in year a?