Economics 120B
Fall 2008
Dr. Maria Cândido
Student Name:_____________________________________
Student ID:________________________________________
Economics 120B Midterm Examination
Fall Quarter
November 5
th
, 2008
Instructions:
a.
You have 50 minutes to finish your exam. Write your name and student ID number on the
upper left corner of this page.
b.
Confirm that your test has
8
pages. Make sure you find the formula sheet, as well as the
standard normal distribution table, 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 pen to write your answers. You give up your right to a regrade if you choose to use a
pencil.
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
32
Part II
1.
20
2.
28
3.
20
Exam Total
100
f.
With you, you should only have a pen, and a basic calculator.
g.
You will NOT be allowed to leave the room during the exam. Turn off your cell phone and
your IPod, and good luck!
1
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View Full DocumentEconomics 120B
Fall 2008
Dr. Maria Cândido
PART I: MultipleChoice Questions
(4 points each, 32 points total)
1)
In the population you are studying (people who live alone), there are 40% of men and 60% of women. If
you know that the mean number of takeout dinners in a month for men is 25, and the mean number for
women is 23, then the overall mean number of takeout dinners per month (for the population) is roughly
a.
23.6.
b.
23.8.
c.
24.
d.
24.2.
2)
A student conducted a study and reported that the 95% confidence interval for the mean ranged from 46 to
54. He was sure that the mean of the sample was 50, that the standard deviation of the sample was 15.8, but
could not remember the exact sample size. You decide to help him out: “Your sample size is ___.”
a.
8
b.
15
c.
42
d.
60
3)
Consider the following estimated relationship between housing price in dollars (
price
) and the distance
from a recently built garbage incinerator, in feet (
dist
):
. If you decided to
measure the distance in yards, rather than feet, and reestimate the model, what would be the new estimated
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 Spring '07
 Newhouse
 Economics, Statistics, Normal Distribution, Standard Deviation, Statistical hypothesis testing, Dr. Maria Cândido

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