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MIDTERM EXAM
ECON 120
Econ 120B: Homework 3 Solutions
Professor Dahl, UC San Diego
February 5, 2017
Stock and Watson, 4.3
(a) The coefficient 9.6 shows the marginal effect of Age on AW E; that is, AW E is expected
to increase by $9.6 for each additional year of age. 696.7 is t
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Fall 2009 Santamaria
Multiple Choice:
All included
Part II: Short Answer
2.) D not included
E not included
3.) a.) included with exception of dummy variable
b.) not included
Fall 2011 Candido
Multiple Choice:
2.) Not included
Part II: Short Answer
1.) a.)
Economics 120B
Fall 2012
Dr. Maria Cndido
Student Name:_
Student ID:_
Name of Student to your right:_
Name of Student to your left: _
Economics 120B Midterm Examination Solutions
Fall Quarter
November 8th, 2012
Version A
Instructions:
a.
You have 80 minut
Economics 120B
Fall 2012
Dr. Maria Cndido
Student Name:_
Student ID:_
Name of Student to your right:_
Name of Student to your left: _
Economics 120B Midterm Examination
Fall Quarter
November 8th, 2012
Version A
Instructions:
a.
You have 80 minutes to fini
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Omitted Variable Bias
(SW Section 6.1)
The error u arises because of factors, or variables, that
influence Y but are not included in the regression function.
There are always omitted variables.
Sometimes, the omission of those variables can lead to bias i
Economics 120B
Fall 2012
Dr. Maria Cndido
Student Name:_
Student ID:_
Name of Student to your right:_
Name of Student to your left: _
Economics 120B Final Examination
Fall Quarter
December 12th, 2012
Version A
Instructions:
a.
You have 3 hours to finish y
Solutions to Chapter 8 Questions from past exams:
Multiple Choice:
1) To decide whether
or ln(Y ) = 0 + 1 X + u fits the data better, you cannot
consult the regression
because
a. ln(Y) may be negative for 0<Y<1.
b. the TSS(total sum of s
Chapter 8 Questions from past exams:
Multiple Choice:
1) To decide whether
or
fits the data better, you cannot
consult the regression
because
a. ln(Y) may be negative for 0<Y<1.
b. the TSS(total sum of squares) are not measured in the same
1
Prof. scar Jord
Problem Set 3
Due Date: Thursday, May 8
ECONOMETRICS
STUDENTS NAME:
Multiple Choice Questions [20 pts]
Please provide your answers to this section below:
1.
6.
2.
7.
3.
8.
4.
9.
5.
10.
1) When the estimated slope coefficient in the simpl
Economics 120B
Fall 2012
Dr. Maria Cndido
Student Name:_
Student ID:_
Name of Student to your right:_
Name of Student to your left: _
Economics 120B Final Examination Solutions
Fall Quarter
December 12th, 2012
Version A
Instructions:
a.
You have 3 hours t
1. Heteroskedasticity means that
A) homogeneity cannot be assumed automatically for the model.
B) the variance of the error term is not constant.
C) the observed units have different preferences.
D) agents are not all rational.
Correct answer(s): B
2.
Wit
Economics 120B
Fall 2011
Dr. Maria Cndido
Student Name:_
Student ID:_
Name of Student to your right:_
Name of Student to your left: _
Economics 120B Final Examination
Fall Quarter
December 8th, 2011
Version A
Instructions:
a.
You have 3 hours to finish yo
Solutions to Chapter 8 Questions from past exams:
Multiple Choice:
1) To decide whether
or ln(Y ) = 0 + 1 X + u fits the data better, you cannot
consult the regression
because
a. ln(Y) may be negative for 0<Y<1.
b. the TSS(total sum of s
Econ 120B
Chapter 3 Extra Practice Problems
1.
A mail order business prides itself in its ability to fill customers orders in six days, in average.
Periodically, the operations manager selects a random sample of customer orders and determines the
number o
Solutions to Chapter 8 Practice Problems
1.
a.
b.
Differences in attributes of the individuals, such as education, ability, and tenure with an employer,
have not been taken into account. Hence, in itself, this is weak evidence, at best, for discrimination
Econ 120B
Solutions to Chapters 6 and 7 Practice Problems
1.
There is perfect multicollinearity present since one of the three explanatory variables can always be expressed
linearly in terms of the other two ( X 2 = X 1 X 3 ). Hence, there are not really
Econ 120B
Chapters 6 and 7 Extra Practice Problems
1.
You have obtained data on test scores and student-teacher ratios in region A and region B of your state.
Region B, on average, has lower student-teacher ratios than region A. You decide to run the foll