STA 6126
Fall 2004
Exam 2
PRINT
NAME __________
1.
Based on responses of 1600 subjects in General Social Surveys in the mid1980s, a
95% Confidence Interval for the mean number of close friends equals (5.6, 7.2). For
each statement, circle the best response:
Correct
or
Incorrect
.
a)
If random samples of 1600 were repeatedly selected and 95% Confidence
intervals computed based on each sample, then in the long run 95% of the
intervals would contain
μ
.
Correct
or
Incorrect
?
b)
We can be 95% confident that
Y
is between 5.6 and 7.2.
Correct
or
Incorrect
?
c)
95% of respondents had between 5.6 and 7.2 close friends.
Correct
or
Incorrect
?
d)
We can be 95% confident that
μ
is between 5.6 and 7.2.
Correct
or
Incorrect
?
2.
The
P
value for testing H
0
:
μ
=100
vs
H
A
:
μ≠
100 is 0.001 and
100
<
Y
. This
indicates strong evidence that (select the correct answer):
a)
μ=100
b)
μ100
c)
μ<100
3.
A largesample 95% confidence interval for
μ
1
μ
2
is (2.0, 7.0). The
P
value for
testing H
0
:
μ
1
μ
2
=
0
vs
H
A
:
μ
1
μ
2
≠
0 based on the same sample data is (select
the correct answer):
a)
above 0.05
b)
below –0.05
c)
below 0.05
d)
Need more information
4.
Researchers reporting a Ztest to test the alterntative hypothesis that the proportion of
males favoring a candidate is larger than the proportion of females favoring the
candidate (H
A
:
π
M

π
F
> 0) give a
P
value of
0.0643. Their computed test statistic was:
a)
0.0643
b)
1.52
c)
1.85
d)
0.9357
e)
We need more information
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View Full DocumentFor each of the following problems, give the null and alternative hypotheses (be very
careful in notation with respect to symbols and subscripts)
5.
Researchers believe that when faced with the question: “Do you have a favorable
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 Spring '08
 YESILCAY
 Statistics, Normal Distribution, migraine, adverse event rate

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