Econ140MidtermFall2008

# Econ140MidtermFall2008 - Econ 140 Fall 2008 FIRST MIDTERM...

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Econ 140 Department of Economics Fall 2008 Prof. Armando Levy FIRST MIDTERM EXAM You have 90 minutes to complete the exam. There are 100 total points. The problems are not ranked by difficulty. Some statistical tables are attached to the end of this exam. Consult them as you see fit. Please write your answers on the exam itself and show all work. Good luck. 1. (20 points) The following table presents some information about the students of the UC Berkeley in the Fall of 2007: American (Y=1) Non-American (Y=0) Total Undergraduate (X=1) 68% 2% 70% Graduate (X=0) 24% 6% 30% Total 92% 8% 100% Based on this information: a. (5 points) Compute E(Y) and interpret the resulting number. b. (10 points) Calculate and interpret E(Y|X=1) and E(Y|X=0). Page 1 of 6

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Econ 140 Department of Economics Fall 2008 Prof. Armando Levy c. (5 points) A randomly selected student on campus reports that he is non- American. What is the probability that this is an undergraduate student? What is the probability that this is a graduate student? 2.
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Econ140MidtermFall2008 - Econ 140 Fall 2008 FIRST MIDTERM...

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