8. .
Fewer young people are driving. In 1995, 63.9% of people under 20 years old who were e
Bloomberg reported that percentage had dropped to 41.7% in 2016. Suppose these resul
sample of 1,200 people under 20 years old who were eligible to have a driver's license in
a. At 95% confidence, what is the margin of error and the interval estimate of the numbe
years old who had a driver's license in 1995?
to
Margin of error = 0.0272 (to four decimal places)
Interval estimate = 0.6231
.6749
X
(to four decimal places)
b. At 95% confidence, what is the margin of error and the interval estimate of the numbe
years old who had a driver's license in 2016?
Margin of error = 0.0278
(to four decimal places)
Interval estimate =
X
.3900
to
.4440
(to four decimal places)
C. Is the margin of error the same in parts (a) and (b)?
No
Why, or why not?
The margin of error is larger in part (b). This is because the sample proportion is closer to 0.5 it
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