LetX be a random variable taking the values ±1 and ±2 with equal probability. Let Y = X^2.

How do i calculate the Cov(X,Y)?

i'm not sure which formula to use because ive tried Cov(X,Y) = E(XY)-(E(X)E(Y))

but that equals 0

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- Sep 4th 2008, 07:03 PMdexza666CovarianceLetX be a random variable taking the values ±1 and ±2 with equal probability. Let Y = X^2.

How do i calculate the Cov(X,Y)?

i'm not sure which formula to use because ive tried Cov(X,Y) = E(XY)-(E(X)E(Y))

but that equals 0

- Sep 4th 2008, 07:09 PMdexza666
i think i might of figured this one out the covariance is 0 because the random variables are independent?

- Sep 4th 2008, 11:08 PMMoo