Economics 120A
Fall 2008
Dr. Maria Cândido
Student Name:_____________________________________
Student ID:________________________________________
Economics 120A Final Examination Answer Key
Fall Quarter
December 12
th
, 2008
Version A
Instructions:
a.
You have three hours to finish your exam. Write your name and ID number on the upper left
corner of this page. And, in case you wish to do so, please sign the Buckley Waiver.
STUDENT CONSENT FOR RELEASE OF STUDENT INFORMATION
(Buckley Waiver)
I hereby authorize the UCSD Economics Department to return my graded final examination/research paper by placing it
in a location accessible to all students in the course.
I understand that the return of my examination/ research paper as
described above may result in disclosure of personally identifiable information, that is not public information as defined
in UCSD PPM 1602, and I hereby consent to the disclosure of such information.
S
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g
n
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b.
Confirm that your test has
14
pages. Make sure you find the formula sheet, as well as probability
distribution tables, in the pages of your exam. The last page can be used as scratch paper.
c.
There are two parts to this exam – multiplechoice questions (Part I) and longer questions (Part II).
You do not need to justify your answers for the multiplechoice questions. Show ALL your work
for the longer questions.
d.
Use a pencil to enter the multiple choice answers in the scantron. Use a pen to write your answers
to the problems. You give up your right to a regrade if you choose to use a pencil to answer the
problems.
e.
The table below indicates how points will be allocated on the exam. You can answer the questions
in any order you like. Use your time carefully and efficiently.
Question
Points
Part I
24
Part II
1.
8
2.
10
3.
10
4.
6
5
10
6
12
7
12
8
8
Exam Total
100
f.
With you, you should only have a pen, a pencil, and a calculator.
1
g.
You will NOT be allowed to leave the room during the exam. Turn off your cell phone and your
IPod, and good luck!
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View Full DocumentEconomics 120A
Fall 2008
Dr. Maria Cândido
2
PART I: MultipleChoice Questions (1.5 points each, 24 points total).
Enter your answers in the provided Scantron.
1)
Which of the following statements is true regarding the standard deviation?
a.
It cannot assume a negative value.
b.
If it is zero, then all the data values are the same.
c.
It is in the same units as the mean.
d.
All of the above are correct.
2)
We want to a 99% confidence interval for the sample mean. The population standard deviation is known to be 15.
We want our sampling error to be 5. How large should the sample be to accomplish that?
a.
About 240.
b.
About 60.
c.
About 35.
d.
About 25.
3)
If you ask three strangers about their birthday, what is the probability that all were born on different days of the
week?
a.
0.714.
b.
0.667.
c.
0.630
d.
0.612.
4)
The events A and B are independent. Suppose Pr(A) = 0.3 and Pr(B) = 0.10. What is the probability of either A or B
occurring?
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 Spring '08
 Jeyeon
 Economics, Normal Distribution, Standard Deviation, Variance, Dr. Maria Cândido

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