18 In Example 3g we showed that the covariance of the multinomial random variables N 1 and N 2 is equal to mP 1 P 2 by expressing N 1 and N 2 as the sum of indicator variables This result could also have been obtained by using the formula Var(N 1 N 2 ) Var(N 1 ) Var(N 2 ) 2 Cov(N 1 , N 2 ) (a) What...

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18. In Example 3g we showed that the covariance of the multinomial random variables N 1 and...

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18. In Example 3g we showed that the covariance of the multinomial random variables N₁ and N₂ is equal to mP₁P₂ by expressing N₁ and N₂ as the sum of indicator variables. This result could also have been obtained by using the formula Var(N₁ + N₂) = Var(N₁) + Var(N₂) + 2 Cov(N₁, N₂)