Unformatted text preview: No. Since f ( y  x ) 6 = f ( y ) or f ( x,y ) 6 = f ( x ) .f ( y ) for all pairs of x and y . (e) TRUE / FALSE : Covariance( X,Y ) = 0 2. For two random variables W and Z , which of the following is/are true? (a) V ar ( WZ ) = V ar ( W + Z ) always (b) V ar ( WZ ) 6 = V ar ( W + Z ) always (c) V ar ( WZ ) = V ar ( W + Z ) if W and Z are independent of each other (d) V ar ( WZ ) = V ar ( W + Z ) ± constant...
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 Winter '08
 Hascall
 Probability theory, probability density function

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