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Unformatted text preview: ECON 506M (solution) Quiz3B, November 13, 2007 NAME: 1. X and Y have a joint bivariate distribution. f(x,y) = 3x if 0 < y < x < 1 otherwise. For a and b below, state the distribution, state the limits, and draw a small chart of the distribution. a. [8] Find the marginal distribution of Y. g(y) = dx x y 1 3 = 1.5(1y 2 ) for 0<y< 1 = 0 elsewhere b. [10] Find the conditional distribution of (X  Y = 0.6) h (XY = 0.6) = [3x / 1.5(1y 2 ] (for y= 0.6) = 3.125 x for 0.6<x<1 = 0 elsewhere c. [12] Find E(XY) E(XY) = 3 . ) 2 . 5 . ) ( 3 ) 3 ( 1 5 2 1 4 1 1 2 1 1 = = = = y y dy y y ydxdy x dxdy x xy y y 2. [10] Let ) ( ~ 1 1 Poisson W , ) ( ~ 2 2 Poisson W and the two random variables are independent. Use MGF method to find the mass function for 2 1 W W W + = . ) 1 )( ( ) 1 ( ) 1 ( 2 1 2 1 2 1 ) ( * ) ( ) ( + = = = t t t e e e W W W e e e t M t M t M ) ( ~ 2 1 + Poisson W 3. An economist is examining individual incomes in her country where it is assumed that...
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This note was uploaded on 04/14/2011 for the course ECON 506 taught by Professor Staff during the Fall '08 term at University of Illinois, Urbana Champaign.
 Fall '08
 Staff

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