Question: 15.5.1 Prove formula (15.14) showing first that for i # j mn mn Var(lA,) = and COV(IA,I,A , ) = - (m + n)2 (m

15.5.1 Prove formula (15.14) showing first that for i # j mn mn Var(lA,) = and COV(IA,I,A , ) = -

(m + n)2 (m + n)2(m + n - 1) ’

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