Economics 120A
Spring 2007
Prof. Maria Cândido
Final – Version A
1
Economics 120A
Final Examination
Spring Quarter
June 14
th
, 2007
Instructions:
a.
You have 3 hours to finish your final exam. Put your name and student ID number on the cover of
the bluebook.
b.
The Buckley Waiver
is preprinted on the back of your bluebook. If you sign it, you will confirm
that your exam may be returned in the filing cabinets, which are open to all students, in the
Economics Department.
c.
There are two parts to this final – multiplechoice questions (Part I) and longer questions (Part II).
Answer them all in your bluebook
, and please write neatly.
d.
You do not need to justify your answers for the multiplechoice questions.
e.
Show your work for the longer questions.
f.
Use a pen to write your answers. You are giving up your right to a regrade if you choose to use a
pencil.
g.
The table below indicates how points will be allocated on the exam. Use your time carefully and
efficiently.
h.
Make sure your exam has 9 pages. You can find a formula sheet, as well as probability distribution
tables, in the last pages of your exam.
i.
If a numerical answer is
, you may leave it like that. You do not have to make it 3.67
j.
With you, you should only have a pen, a bluebook and a calculator.
k.
You will NOT be allowed to leave the room during the final.
l.
Turn off your cell phone, and your IPod, and good luck!
Question
Points
Part I
24
Part II
1.
10
2.
10
3.
8
4.
12
5.
10
6.
10
7.
8
8.
8
Exam Total
100
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Economics 120A
Spring 2007
Prof. Maria Cândido
Final – Version A
2
PART I: MultipleChoice Questions
(1.5 points each, 24 points total)
1)
As sample size increases, what happens to the population variance (
)?
2)
Consider this probability distribution of the number of courses taken by fulltime undergraduate students:
Number of Courses
Probability
3
0.2
4
0.4
5
0.3
6
0.1
The mean of this distribution is _____ and the standard deviation is _______.
3)
Consider the joint probability table:
Age
Number of Times Married
Adults less than 60
years old
Adults more than 60
years old
Never (0)
0.17
0.04
Once (1)
0.41
0.21
Twice (2)
0.12
0.01
Three times (3)
0.04
0.00
Amongst adults less than 60 years old, what is the average number of times people have been married?
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 Spring '08
 Jeyeon
 Economics, Normal Distribution, Standard Deviation, Statistical hypothesis testing, Prof. Maria Cândido

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