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Unformatted text preview: E [ L ]. c. ind the covariance COV ( L, T ). d. ind the correlation coecient L,T . 2. (2 pts) Consider the Following joint pdF f X,Y ( x, y ) = ( e2  yx 2 x < y < , x else ind E [ Y  X = x ]. 3. (4 pts) The random variables Y 1 , Y 2 , Y 3 and Y 4 have the joint PD f Y 1 ,Y 2 ,Y 3 ,Y 4 ( y 1 , y 2 , y 3 , y 4 ) = ( 4 y 1 y 2 1 , y 3 y 4 1 else a. ind the marginal pdF f Y 2 ,Y 3 ( y 2 , y 3 ). b. ind the marginal pdF f Y 3 ( y 3 ). 1...
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 Fall '08
 GELFAND

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