Ch. 7 of Statistics for Business and Economics ...

7.6 Assume that σ1^2 = σ2^2 = σ3^2. Calculate the pooled estimator of σ^2 ...

7.76 Independent random samples were selected from two normally distributed populations ...

(c) Pooled variance, s2 = [{(n1 - 1) s1^2 + (n2 - 1) s2^2} / (n1 + n2 - 2)] ...

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