# Econometrics: Statistics Homework - Marginal distributions

Anonymous
account_balance_wallet \$35

### Question Description

_____________2019_02_07_______7.04.08.png

### Unformatted Attachment Preview

Homework 1 SW Chapter 2 1. The following table gives the joint probability distribution between employment status and college graduation among those either employed or looking for work in the working age US population for 2008. Unemployed Employed (Y = 0) (Y = 1) Total Non-college grads (X = 0) 0.037 0.622 0.659 College (X = 1) 0.009 0.332 0.341 Total 0.046 0.954 1 a) Using the definition of the expected value, show that the expected value of a binary random variable equals probability of the outcome 1. In other words, suppose you have a random variable that takes on either a value of 1 (called "outcome 1" in the problem set) with probability p or a value of 0 with probability (1-p)). The question asks you to show, using the formula for expected value which you learned in class, that the expected value of this variable equals p b) What are the marginal distributions of X and Y? Using a) compute E(Y) and E(X). c) Calculate E(Y|X = 1 ) and E(Y|X = 0 ) d) Calculate the unemployment rate (probability to be unemployed) for college graduates and noncollege graduates. In other words, suppose you know that someone is a college graduate. What is the probability that she will be unemployed (i.e., conditional probability)? e) Are educational achievement and employment status independent? Explain. 2. The random variable Y has a mean of 1 and variance of 4. Let Z = ½(Y-1). Show that  Z  0 that and  Z2  1 . 1 ...
Purchase answer to see full attachment

mickeygabz
School: Boston College

See attached

Homework 1
SW Chapter 2
1. The following table gives the joint probability distribution between employment status and
college graduation among those either employed or looking for work in the working age
US population for 2008.
Unemployed

Employed

(Y = 0)

(Y = 1)

Total

0.037

0.622

0.659

College (X = 1)

0.009

0.332

0.341

Total

0.046

0.954

1

a) Using the definition of the expected value, show that the expected value of a binary random
variable equals probability of the outcome 1. In other words, suppose you have a random
variable that takes on either a value of 1 (called "outcome 1" in the problem set) with probability
p or a value of 0 with probability (1-p)). The question asks you to show, using the formula for
expected value which you learned in class, that the expected value of this variable equals p

E(x) = ∑𝑛𝑖=1 𝑋𝑖 ∗ 𝑝(𝑋𝑖)
E(x) = 0*(1-p) + 1* p
E(x) = 0 + p
E(x) = p
b) What are the marginal distributions of X and Y? Using a) compute E(Y) and E(X).
E(y) = p (Y...

flag Report DMCA
Review

Anonymous
Tutor went the extra mile to help me with this essay. Citations were a bit shaky but I appreciated how well he handled APA styles and how ok he was to change them even though I didnt specify. Got a B+ which is believable and acceptable.

Brown University

1271 Tutors

California Institute of Technology

2131 Tutors

Carnegie Mellon University

982 Tutors

Columbia University

1256 Tutors

Dartmouth University

2113 Tutors

Emory University

2279 Tutors

Harvard University

599 Tutors

Massachusetts Institute of Technology

2319 Tutors

New York University

1645 Tutors

Notre Dam University

1911 Tutors

Oklahoma University

2122 Tutors

Pennsylvania State University

932 Tutors

Princeton University

1211 Tutors

Stanford University

983 Tutors

University of California

1282 Tutors

Oxford University

123 Tutors

Yale University

2325 Tutors