Econ 122A Problem Set 3 Name(Print)_
Due in class on May 3 UCI ID_
14, MultipleChoice Questions (Choose the best answer, and briefly explain your
reasoning.)
1. For a simple linear regression Income BMI u . Given a random sample of
data, which o
Econ122AProblemSet1Name(Print)_
DueinclassonApril17
1.AssumeY=1+2X+u,whereX,Y,anduarer.v.s,uisindependentofXwithE(u)=0
and Var (u )= 2 .
1) CalculateE(u|X=0),E(u|X=3),E(u|X),E(Y|X=0),E(Y|X=3),andE(Y|X)
E (u | X = 0) = E (u ) = 0 asuisindependentofX
E (u |
Econ 122A Sample Final Solutions
Note for all the hypothesis testing, use the 5% signicance level.
1-7, Multiple Choice Questions (choose the best answer, and briey explain your reasoning.)
1. Which of the following models is a linear regression model?
(a
Econ 122A Problem Set 2 Name(Print)_
Due in class on April 30 UCI ID_
15, MultipleChoice Questions (Choose the best answer, and briefly explain your
reasoning.)
1. What can be said about the estimated slope coefficient for a regression of Y on X,
Econ 122A Problem Set 1 Name(Print)_
Due in class on April 14 UCI ID_
1. Assume Y=1+3X+u, where X, Y, and u=v+X are r.v.s, v is independent of X with
E(v)=0, Var (v)= 2 ,E(X)=4, and Var(X)=1.
1) Calculate E(u|X), E(Y|X), E(u|X=1), E(Y|X=1), E(u)
Discussion Section Week 2 Agenda
I.
Quick Review of Probability (Stock-Watson Chapter 2)
II.
Exercises 2.7, 2.13, 2.23, 2.25, 4.1
Review of Probability
Bernoulli random variable is a binary random variable that takes on the values of 0 or 1
o
Bernoulli va
ECN 122A Problem Set 1 Solutions
1
For any questions on the solutions contact Michael Guggisberg, mguggisb@uci.edu
1. Assume Y=1+2X+u, where X, Y, and u=v+X are r.v.s, v is independent of X with
E(v)=0,Var(v) = 2 , E(X)=2, and Var(X)=1.
1.1 Calculate E(u|
ECON 122B
Spring 2015
Sample Midterm II
1.
A researcher investigating the determinants of crime in the United Kingdom has data for 42
police regions over 22 years. She estimates by OLS the following regression
ln(cmrt)it = i + t + 1unrtmit + 2proythit + 3
Econ 122A Sample Midterm Name (print)_
UCI ID_
Multiplechoice Questions (4 points each in total, where choose the best answer,
2 points, and briefly explain your reasoning, 2 points.)
1. Which of the following models is a linear regression model?
Econ 122A Problem Set 1 Name(Print)_
Due in class on Jan 21 UCI ID_
1. Assume Y=1+3X+u, where X, Y, and u=v+X are r.v.s, v is independent of X with
E(v)=0, Var (v)= 2 ,E(X)=4, and Var(X)=1.
1) Calculate E(u|X), E(Y|X), E(u|X=1), E(Y|X=1), E(u) a
Problem Set 3 Solutions
Jason Ralston
May 5, 2015
1. For a simple linear regression Income = + BM I + u. Given a
random sample of data, which of the following statements is true?
(a) OLS estimators are biased when BMI do not vary much in the
sample
(b) OL
Problem Set 3 Solutions
Jason Ralston
May 5, 2015
1. For a simple linear regression Income = + BM I + u. Given a
random sample of data, which of the following statements is true?
(a) OLS estimators are biased when BMI do not vary much in the
sample
(b) OL
Econ 122A Problem Set 3 Name(Print)_
Due in class on May 5 UCI ID_
13, MultipleChoice Questions (Choose the best answer, and briefly explain your
reasoning.)
1. For a simple linear regression Income BMI u . Given a random sample of
data, which o
Econ 122A Midterm
Name (print)_
Feb 12, 2015
UCI ID_
Good luck!
Multiple-choice Questions (5 points each in total, where choose the best answer,
2 points, and briefly explain your reasoning, 3 points.)
1. Which of the following models is a linear regressi
Econ 122A Problem Set 3 Name(Print)_
Due in class on Feb 9 UCI ID_
14, MultipleChoice Questions (Choose the best answer, and briefly explain your
reasoning.)
1. For a simple linear regression Income BMI u . Given a random sample of
data, which o
Instructor: Jose Antonio Rodriguez Assignment: Chapter 1 & 2 Homework
Lopez
Course: Econ 122A Fall 20l 5
Book: Stock/Watson: Introduction to
Econometrics, 3e Update
1. You are asked to study the causal effect of a. an observational time series data set.
Econ 122A Problem Set 2
Due in class on April 30
Name(Print)_
UCI ID_
1-5, Multiple-Choice Questions (Choose the best answer, and briefly explain your
reasoning.)
1. What can be said about the estimated slope coefficient for a regression of Y on X,
vs. th
Econ 122A Midterm Solutions
Multiple-choice Questions (4
points.)
points each
in total: choose the best answer,
2 points;
briey explain your reasoning,
2
1. In the simple linear regression Y = + X + u, the slope
(a)
(b)
(c)
(d)
indicates the percentage of
Econ 122A Sample Midterm Name (print)_
UCI ID_
Multiplechoice Questions (4 points each in total, where choose the best answer,
2 points, and briefly explain your reasoning, 2 points.)
1. Which of the following models is a linear regression model?
ECN 122A Problem Set 2 Solutions
1
I have written up multiple solutions for some of the questions; either solution will be acceptable. For any questions on the solutions contact Michael Guggisberg, mguggisb@uci.edu.
1) What can be said about the estimated
Econ 122A Sample Midterm Name (print)_
UCI ID_
Multiplechoice Questions (4 points each in total, where choose the best answer,
2 points, and briefly explain your reasoning, 2 points.)
1. Which of the following models is a linear regression model?
Homework #3
Solutions
Econ 122A
10 February 2016
1. For a simple linear regression Income = + BM I + u, given a random sample of data, which of the
following statements is true?
(a) OLS estimators are biased when the error u captures perseverance and self
Econ 122A Problem Set 4 Name(Print)_
Due in class on Feb 27
1-7, Multiple-Choice Questions (Choose the best answer, and briefly explain your
reasoning.)
1. Suppose you are interested in the effect of class attendance on college performance,
and pla
Instructor: Jose Antonio Rodriguez
Lopez
Course: Econ 122A Fall 20l 5
Book: Stock/Watson: Introduction to
Econometrics, 3e Update
Assignment: Chapter 3 Homework
What is the difference between an estimator and an estimate?
(“1A.
(“1 B.
II 1C.
(“1 D.
An e
occurs where marginal revenue equals marginal cost, which occurs at a
market output of 45 units, and the corresponding monopoly price is
$55.11 If Samsung and LG were to 1973 1974 1975 1976 Total Actual
capacity expansiona 0.6 1.0 1.4 6.2 9.2 Predicted ca
because firms will enter the market to take advantage of the profit
opportunity. As more firms come into the market, each firms share of
overall market demand will fallthat is, the typical firms demand curve
will shift leftward. Entry and the resultant le
nearly identical products, and each provides a good approximation to a
perfectly competitive industry. APPLICATION 13.1 Market Structure
Metrics for U.S. Manufacturing Industries TABLE 13.2 Four-firm
Concentration Ratios and Herfindahl-Hirschman Indices f
F, causing the residual demand curve to rotate leftward to DR. The new
profitmaximizing quantity for the dominant firm is 50 units, and the
profit-maximizing price is $42. At this price, the fringe supplies 33 units
of the total market demand of 83 units.
60 percent of online searches, roughly 4 times larger than its nearest
competitor, Yahoo. Its earnings were well over $22 billion. Yet when you
use Google, you do not pay them a dime. So how did the company earn
$22 billion? The answer is that nearly all
above marginal cost, and the Cournot equilibrium approaches the
perfectly competitive equilibrium only as the number of competitors in
the market becomes large. In the Bertrand model, by contrast,
competition between even two firms is enough to replicate