Dependent but Uncorrelated Random Variables. Suppose that the random variable X can take only the three values - 1 , 0, and 1, and that each of these three value has the same probability. Also, let the random variable Y be defined by the relation Y = X. We shall show than X and Y are clearly dependent but uncorrelated.
In this example, X and Y are clearly dependent, since the value of Y is completely determined by the value of X. However