independe n1 constitut- ing a random sample from an infinite population with the mean ₁ and the variance of and the other n2 constitut ing a random sample from an infinite population with the mean μ2 and the variance o2, then (a) E(X₁-X₂) = μ₁ −μ2; 0² of n₁ (b) var(X₁-X₂) = + 0² n₂

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