Question: For a random sample X 1 , . . . , X n , show that E(X: - 4)? = (X: X) + n(X ).

For a random sample X1, . . . , Xn, show that

E(X: - 4)? = (X: – X)² + n(X – µ)². i=1 i=1

E(X: - 4)? = (X: X) + n(X ). i=1 i=1

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