Economic Statistics Exam 1
Last name:
February 17, 2009
First name:
PPID:
Section number:
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This exam contains
fifteen
short answer questions
(
worth 6 points each
)
and
three
long answer questions
(
worth 15 points each
)
. Show your work clearly to be eligible
for partial credit. In all problems where you need to make a calculation, simplify your
answer as much as convenient. In questions with multiple parts, you should respond
as if your answers to previous parts were correct.
Formulas:
P
[
X
]
=
N
!
X
!(
N
!
X
)!
p
X
(1
!
p
)
N
!
X
P
[
X
]
=
e
!
μ
μ
X
X
!
Short Questions
(
6 points apiece
)
1. Suppose that overall,
20%
of people have blond hair, and
25%
of people have blue
eyes, but
60%
of the population has neither blond hair nor blue eyes. Are these two
events independent?
(
Explain.
)
2. In the previous problem, what is the probability that a person has blond hair or
blue eyes
(
or both
)
?
3. How do we determine the length of the whiskers in a box

and

whisker plot?
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Econ 400 Midterm 1, page 2 of 7.
4. According to the National Weather Service, Chapel Hill has
2.7
snowy days per
year, on average. What is the probability that we have three or more?
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 Spring '08
 turchi
 Standard Deviation, chance, Blond hair, mean weekly earnings

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