
AP Stat Confidence Interval Proportion
Authored by Anthony Clark
Mathematics
12th Grade

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13 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In a survey of 104 students, it was found that 79 went to the homecoming game this year. Calculate a 99% confidence interval for p.
(0.652, 0.868)
(0.691, 0.829)
(0.678, 0.842(
(0.685, 0.895)
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A preliminary study suggests that 17% of people agree on an issue. How large must your sample size be so you could be within ± 5% with 95% confidence?
217
30
2
152
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A preliminary study suggests that 87% of people agree on an issue. How large must your sample size be so you could be within ± 3% of p calculate at 90% confidence?
7
466
5
338
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
If 827 represents "no" voters out of 2584, construct a 95% confidence interval for the "no" group.
[.300,.340]
[.298,.342]
[.302,.338]
[.288,.352]
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
You have no preliminary study to work from. How large must your sample size be so you could be within ± 3% of p at 90% confidence?
748
1068
11
1495
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Find the critical value, z* for 97%
1.88
2.17
-1.88
-2.17
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The symbol for the sample proportion is __________.
Zc
p̂
E
q
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