Problem Set II: Suggested Solutions
ECON103: Summer 2011 (Session A)
Federico Zincenko
Due Date: Tuesday 19th, at the beginning of Federicos lecture.
Analytical Questions
1. True or false. Provide an explanation.
(a) In the multiple linear regression mode

Problem Set III: Suggested Solutions
ECON103: Summer 2011 (Session A)
Federico Zincenko
Due Date: Tuesday 26th, at the beginning of Federicos lecture.
Analytical Questions
1. True or false. Provide an explanation.
(a) Consider the model ln(wi ) = 0 + 1 DF

PRACTICE QUESTIONS FOR FINAL EXAM.
1. Suppose you want to estimate the impact of education on earnings and you run a
regression of the logarithm of wages (Y) on the logarithm of years of education (X).
Using in STATA the command: regress Y X you get this

Problem Set I: Suggested Solutions
ECON103: Summer 2011 (Session A)
Federico Zincenko
1
Analytical Questions
1. True or False. Explain.
(a) The expected value of a discrete random variable is the outcome that is most likely to
occur.
False: By denition of

Part 5 (80 points):
The following dataset contains information on students in a class.
as follows:
Obs:
The data is
680
attend
termgpa
priGPA
frosh
soph
junsen
classes attended out of 32
GPA for term
cumulative GPA prior to term
=1 if freshman
=1 if sopho

Economics 103
Introduction to Econometrics
Spring 2009
Professor: Maria Casanova
FINAL EXAM
TIME ALLOWED: 3 hours
Instructions:
DO NOT USE A CALCULATOR
For complicated math, simply set up the problem but do not solve it.
You will be graded on your setup.

Part 5 (50pointsin total)
i
Thefollowingdataset ontalnsnformation n worke$in a firm. Thedatais asfollows:
c
o
Obs:680
sales
sick
presales
white
black
hispan
Number of salesfinalized in December2008
Number of daysworker called in sick in 2008
Average numbe

PART 2
(40 points total)
You estimate the following model by OLS:
W agei = 0 + 1 Agei + 2 Age2 + 3 Educi + i ,
i
where W agei measures individual is hourly wage, Agei is age in years and Educi are years of
full-time education.
1. Somebody points out that

Econ 103 - Spring 2012
Suggested Solutions for Problem Set 4
1
Problem 6.3
(a)
N
ei 2 = (N K ) 2 = (20 3)(2.5193) = 42.8281
Unexplained Variation =
i=1
N
(yi y )2 =
Total Variation =
i=1
N
2
i=1 ei
1 R2
2
ei 2 802.02 42.8281 = 759.1962
(yi y )
i=1
i=1
(b

Midterm Exam: Suggested Solution
ECON103: Summer 2011 (Session A)
Tuesday, July 5th
Name:
UID:
Instructions: This exam is closed-book and no calculators, or any electronic devices, are allowed.
For complicated math, simply set up the problem but do not so

Part 5 (80 points):
The following dataset contains information on students in a class.
as follows:
Obs:
The data is
680
attend
termgpa
priGPA
frosh
soph
junsen
classes attended out of 32
GPA for term
cumulative GPA prior to term
=1 if freshman
=1 if sopho

Practice Problems for the Final
ECON103: Summer 2012 (Session A)
Federico Zincenko
The following exercises from HLG (2011): 5.5, 5.8, 5.9, 6.5, 6.6, 6.8, 7.1, 7.2, 7.3, 7.4, 8.1, 8.4, 8.5,
and 8.6.
NO SOLUTIONS WILL BE PROVIDED. ANY QUESTION WILL BE DISCU

Midterm Exam - Suggested Solutions
ECON103: Summer 2012 (Session A)
Thursday, July 12th
1 (20 points, 4 each) True or false. Provide an explanation.
(a) If Y and X are independent, it follows E (Y X ) = E (Y )E (X ).
True, because fY,X (y, x) = fY (y )fX

Final Exam
ECON103: Summer 2011 (Session A)
Federico Zincenko
DATE: Thursday, July 28th, 2011.
INSTRUCTIONS: This exam is closed-book and no calculators, nor any electronic devices, are
allowed. For complicated math, simply set up the problem but do not s