Is it possible to say in general which of E(X2) and E(X)2 will be larger?
a) Give an example of two random variables Y and Z such that E(Y 2) > E(Y )2 and E(Z2) < e(z)2="" or="" explain="" why="" one="" of="" these="" two="" is="">
b) Is it possible that E(X2) = E(X)2? If so, give an example. If not, explain why not.