Exam 3 Review
1.
In the sample of 16 children who wore braces, the average amount of time the children wore braces was 10.2 months
with a known standard deviation of 4.04 months.
Construct a 92% confidence interval for the true average length of time
children wear braces.
a.
Describe what this interval means.
2.
According to a survey of 10829 likely voters
(source
www.surveyusa.com
) on November 7, 2006,
6281 said they
would vote NO on California Proposition 85 (parental notification).
a.
The point estimate of the population proportion of likely voters who would vote NO on Prop 85 was
___________.
b.
Construct a 95% confidence interval for the population
proportion of voters
who would vote NO on Prop 85.
•
Confidence Interval is
(___________, __________)
•
Write two different complete sentences interpreting the confidence interval.
3.
State the
null hypothesis
H
o
, and the
alternate hypothesis
H
a
, in terms of the appropriate parameter ( µ or
p
)
a)
NBA claims that the mean weight of a basketball player is at most 259 lbs.
b)
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 Fall '11
 Plum
 Statistics, Standard Deviation, Statistical hypothesis testing, Denmark, Type I and type II errors

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