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Lecture 11

ECON 2209 Lecture 11: 17February_EconStats_Karagodsky

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ECON 2209

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EconStatistics February 17 2017 Midterm 1 Coverage Question 1 Information you need to know to answer this question: If X and Y are independent then: P(XY) = P(X) P(YX) = P(Y) P(X,Y) = P(X)*P(Y) Cov(X,Y) = 0 With this information then: 1. P(X) = P(Y), true 2. P(XY) = P(Y), false 3. P(X,Y) = P(X)*P(Y), true 4. P(X,Y) P(X) P 5. P(XY) = yP(x;y);true Question 2 In 2013 Boston mayoral prelim, there was 12 candidates, 6 white and 6 non white. In the nal round 2 white candidates remain. a. What is the probability of this happening? 6 6 6! 6! P(2W) = P(2W0Nw) = C 2 C0 = 2!4! 0!6! C 22 12! 2!10! Question 3 GPA >3.75 is event A Being admitted is event B 1
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