Mid2Problems4 - Midterm Exam 2 Practice Problems -...

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Midterm Exam 2 Practice Problems - Econometrics 120A 1. Consider the following fictional joint distribution of the color of car driven and the number of speeding tickets received per year. Car Color / Tickets per year 0 Tickets 1 Ticket 2 Tickets White 1/10 1/10 0 Red 0 1/10 3/10 Blue 1/10 2/10 1/10 (a) What is the probability of receiving 0 tickets? What is the probability of getting 1 ticket? What is the probability of getting 2 tickets? (b) What is the probability of driving a red car conditional on having received 2 tickets? What is the probability of driving a red car conditional on having received no tickets? (c) Are the number of tickets received and the color of the car independent? (d) What is the mean of the number of tickets? What is the variance of the number of tickets? (e) Does the concept of covariance make sense in this context? Justify your answer. 2. The true proportion of Democrats is 0.45, while the proportion of Republicans is 0.55. Suppose you poll 5 people, and let X
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This note was uploaded on 11/30/2010 for the course ECON 120A 1684210 taught by Professor Elliot during the Spring '10 term at UCSD.

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Mid2Problems4 - Midterm Exam 2 Practice Problems -...

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