Why E[XY|W = w] = E[X|W = w]* E[Y|W = w] is true when X an Y are Two conditionally independent discrete random variables and W is a random discrete variable ?
if X and Y are conditionally independent given W = w, then why E[XY|W = w] = E[X|W = w]* E[Y|W = w]
How do we even calculate E[XY|W = w] ?