Question 7: Suppose that X and Y are discrete random variables. 1) (2 points) Show that E [ X Y ] = E [ XE [ Y X ]] . Cov ( X , Y ) = Cov ( X , E [ Y X ])
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Question 7- Suppose that X and Y are discrete random variables- 1) (2.docx
1. Question 7: Suppose that X and Y are discrete random variables. 1) (2 points) Show that E [ X Y
] = E [ XE [ Y X ]] . Cov ( X , Y ) = Cov ( X , E [ Y X ])