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Economic Statistics Exam 2
Last name:
March 30, 2010
First name:
PID:
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This exam contains
fifteen
short answer questions (worth 6 points each) and
three
long answer questions (worth 20 points each).
Please answer in the space
provided; if you need more room, indicate clearly that the answer is continued
on the back of the page.
In all problems where you need to make a calculation,
simplify your answer as much as possible.
Show your work clearly to be eligible
for partial credit.
Some PDFs:
Some probabilities:
f
(
x
)
=
1
2
πσ
2
e
−
(
X
−
μ
)
2
σ
2
P
[
x
≤
a
]
=
1
−
e
−
λ
a
f
(
x
)
=
1
u
−
P
[
x
]
=
x
e
−
x
!
f
(
x
)
=
e
−
x
P
[
x
]
=
n
!
x
!(
n
−
x
)!
p
x
(1
−
p
)
n
−
x
1.
The random variable
X
has a normal distribution with a mean of 16 and
standard deviation of 5. What is the probability that the variable take a value
between 15 and 20?
2.
In a random sample of 200 people, 16 are lefthanded. Construct a 90%
confidence interval for the proportion of the population who are lefthanded.
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View Full Document Econ 400 Midterm 2, page 2 of 7.
3.
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This note was uploaded on 01/11/2012 for the course ECON 400 taught by Professor Turchi during the Fall '08 term at UNC.
 Fall '08
 turchi

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