The purpose of this exercise is to show why the interchange of expectation and sum in the proof of Wald’s equality is justified when E [J] 1 , X 2 , . . . , be a sequence of IID rv’s, each with the...

The purpose of this exercise is to show why the interchange of expectation and sum in the proof of Wald’s equality is justified when E [J] <>₁, X₂, . . . , be a sequence of IID rv’s, each with the distribution FX. Assume that E [|X|]