給定 X(i) (for i=1,2.3,...,n)為一random sample
S^2 為其樣本變異數
考慮 E[X(i)] = theta1
E[X(i)-theta1]^2 = theta2
E[X(i)-theta1]^3 = theta3
E[X(i)-theta1]^4 = theta4
Show that Var(S^2) = [theta4 - (n-3)*(theta2)^2/(n-1)]/n
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