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Test 12A
AP Statistics
Name:
Directions:
Work on these sheets. Answer completely, but be concise.
A normal probability table is
attached
.
Part 1:
Multiple Choice.
Circle the letter corresponding to the best answer.
1.
In an opinion poll, 25% of a random sample of 200 people said that they were strongly opposed to
having a state lottery.
The standard error of the sample proportion is approximately
(a) 0.03
(b) 0.25
(c) 0.0094
(d) 6.12
(e) 0.06
(f) None of the above.
The answer is _____________________________.
2.
You want to design a study to estimate the proportion of students on your campus who agree with
the statement, “The student government is an effective organization for expressing the needs of
students to the administration.”
You will use a 95% confidence interval and you would like the
margin of error to be 0.05 or less.
The minimum sample size required is approximately
(a) 22
(b) 1795
(c) 385
(d) 271
(e) None of the above.
The answer is _____________________________.
3.
An opinion poll asks a random sample of adults whether they favor banning ownership of
handguns by private citizens.
A commentator believes that more than half of all adults favor such a
ban.
The null and alternative hypotheses you would use to test this claim are:
(a)
5
.
0
ˆ
:
;
5
.
0
ˆ
:
0
=
p
H
p
H
a
(b)
5
.
0
ˆ
:
;
5
.
0
ˆ
:
0
≠
=
p
H
p
H
a
(c)
5
.
0
:
;
5
.
0
:
0
≠
=
p
H
p
H
a
(d)
0
:
;
0
:
0
=
p
H
p
H
a
(e) None of the above.
The answer is _____________________________.
4.
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 Spring '11
 Smith
 Statistics, Probability

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