Question

Let f be the pdf on a continuous random variable Z. The variance of Z is given by σZ and the pdf is symmetric (f(x) = f(−x)) and everywhere positive. Define another random variable X as X = α3Z3 + α2Z2 + α1Z + α0. (i) For which values of αi are X and Z un

Let f be the pdf on a continuous random variable Z. The variance of

Z is given by σZ and the pdf is symmetric (f(x) = f(−x)) and everywhere positive.

Define another random variable X as X = α3Z3 + α2Z2 + α1Z + α0.

(i) For which values of αi are X and Z uncorrelated?

(ii) For which values of αi are X and Z independent?



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Let f be the pdf on a continuous random variable Z. The variance of Z is given by σZ and the pdf is symmetric (f(x) = f(−x)) and everywhere positive. Define another random variable X as X = α3Z3 + α2Z2 + α1Z + α0. (i) For which values of αi are X and Z un
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