Copyright 2013 Graham Elliott. All Rights Reserved.
Descriptive/Informal Statistics
This section of the course shows some basic presentations of data. Statistics is really about understanding
the representation, a rst step in this is to understand what (a

Midterm Exam 1 - Economics 120a, Winter 2013
Tue-Thurs 3.30pm Lecture
Question: 1 (5 pts) You examine returns on a set of investments and nd
that the mean return is 14.4%. Assuming that returns are normally distributed,
with a standard deviation of 4.4%,

Midterm Exam 2 Practice Problems Answer Key
1. Consider the following ctional joint probability distribution of the color of car driven and the number of speeding tickets received per year. Car Color / Tickets per year White Red Blue 0 Tickets 1/10 0 1/10

Midterm Exam 2 Practice Problems - Econometrics 120A
1. Consider the following joint probability distribution of years of experience in a job and annual salary: Experience / Salary 0 years 10 years $30, 000 1/3 0 $60, 000 1/6 1/6 $90, 000 0 1/3
(a) What i

Econometrics 120A
The course introduces students to the science of statistics, building student skills in the analysis of data and introducing the formal methods used by statisticians to learn about the real world. As a building block students will be int

A Model of Money and Credit, with Application to the Credit Card Debt Puzzle
Irina A. Telyukova University of California San Diego Randall Wright University of Pennsylvania
August 27, 2007
Abstract Many individuals simultaneously have signicant credit car

Midterm Exam 1 - Economics 120a, Winter 2013
Tue-Thurs 5pm Lecture
Question 1 (5 pts) For one university parking lot, the parking o ce claims
that 80% of parking tickets written are paid. Tickets are for $50 each, and 10
tickets are issued each day.
An au

Midterm Exam 2 - Economics 120a, Winter 2013
Tue-Thurs 3.30 pm Lecture
Question 1 (6 pts). Consider the following joint probability distribution for
random variables X and Y:
XnY 0
1
1
0.2 0.2
2
0.4 0.2
(a) (1 pt) What is the conditional distribution of X

Midterm Exam 1 - Economics 120a, Winter 2013
Tue-Thurs 5pm Lecture
Question 1 (6 points): At a local tax preparer, they advertise that the average
tax return costs $190 to prepare. Suppose that the standard deviation is 40. In
a sample of 30 returns, you

Copyright 2010 Graham Elliott. All Rights Reserved.
Data Generation
The math behind the sampling calculations we did in the last chapter are all wonderful, and help us answer
the questions about whether or not the results are something real or just due to

Copyright 2013 Graham Elliott. All Rights Reserved.
Descriptive/Informal Statistics
This section of the course shows some basic presentations of data. Statistics is really about understanding
the representation, a rst step in this is to understand what (a

Copyright 2013 Graham Elliott. All Rights Reserved.
Probability Distributions
This section is all about how to use ideas of randomness to begin to understand the types of statistics we
would like to compute. The concepts of random variables and their dist

Copyright 2013 Graham Elliott. All Rights Reserved.
Probability Distributions
This section is all about how to use ideas of randomness to begin to understand the types of statistics we
would like to compute. The concepts of random variables and their dist

Copyright 2013 Graham Elliott. All Rights Reserved.
Sampling
We are now putting all of the pieces together. Considering each observation xi as an outcome from a random variable Xi , we have that functions g (x1 ; x2 ; :; xn ) are draws from the random var

Copyright 2013 Graham Elliott. All Rights Reserved.
Sampling
We are now putting all of the pieces together. Considering each observation xi as an outcome from a random variable Xi , we have that functions g (x1 ; x2 ; :; xn ) are draws from the random var

Copyright 2013 Graham Elliott. All Rights Reserved.
Two Random Variables
After mastering univariate random variables and their distributions, the next step is to extend this to
joint distributions. Joint distributions are neccessary for a number of reason

Midterm Exam 2 Practice Problems - Econometrics 120A
1. Consider the following ctional joint distribution of the color of car driven and the number of speeding tickets received per year. Car Color / Tickets per year White Red Blue 0 Tickets 1/10 0 1/10 1

Midterm Exam 2 Practice Problems Answer Key
1. A ctional study examined the joint distribution of education levels and GDP levels across countries. The following is the joint probability distribution. Education is entered in the left most column, and GDP

Final Practice Problems Answer Key - Econometrics 120A
dss.ucsd.edu/a2santos/Econ120a.htm 1. The following is a ctional joint probability distribution for GDP growth in the US and China. US GDP growth is entered in the left most column, and Chinese GDP gr

Final Practice Problems - Econometrics 120A
1. The following is a ctional joint probability distribution for level of education and income. Level of education is in the left most row and income on the top most row. Education/Income High School College 20,

Final Practice Problems- Answer Key
1. The following is a ctional joint probability distribution for level of education and income. Level of education is in the left most row and income on the top most row. Education/Income High School College 20,000
4 25

Final Practice Problems - Econometrics 120A
1. The following is a ctional joint probability distribution for level of household income and the type of computer a household owns. Computer type is entered in the left most column, and level of income on the

Final Practice Problems - Answer Key
1. The following is a ctional joint probability distribution for level of household income and the type of computer a household owns. Computer type is entered in the left most column, and level of income on the top mos

1. The following is a ctional joint probability distribution for the years of education an individual possess and their income. Notice that 12 years of education corresponds to graduating from high school, 16 to graduating from college and 20 to having an

Final Practice Problems - Answer Key
1. The following is a ctional joint probability distribution for years of education an individual possesses and their income. Notice that 12 years of education corresponds to graduating from high school, 16 to graduati

1. The following is a ctional joint probability distribution for the age of an individual and the neighborhood of San Diego in which he lives. Neighborhood/Age Pacic Beach North Park La Jolla 25 years 0.2 0.1 0 35 years 0.1 0.2 0.1 60 years 0 0.1 0.2
(a)

Final Practice Problems - Answer Key
1. The following is a ctional joint probability distribution for the age of an individual and the neighborhood of San Diego in which they live. Neighborhood/Age Pacic Beach North Park La Jolla 25 years 0.2 0.1 0 35 yea

Useful Formulas and Definitions
Summary Statistics 1. Quantile/Percentile of Observation i = (Number of Obs i)/(Total Number of Obs) 2. Median: The smallest number A such that percentile(A) 0.5. 3. Lower Quartile: The 25th quantile. 4. Upper Quartile: Th

Midterm Exam 2 Practice Problems- Econometrics 120A
1. Consider the following ctional joint probability distribution for returns on stocks and bonds. Stock returns are entered in the left most column and bond returns in the top most row. Stocks/Bonds 10%

Midterm Exam 2 Practice Problems - Answer Key
1. Consider the following ctional joint probability distribution for returns on stocks and bonds. Stock returns are entered in the left most column and bond returns in the top most row. Stocks/Bonds 10% 0% 10%