Continuation of Exercise 7 15 Suppose that both populations have the same variance that is sigma 2 1 sigma 2 2 sigma Show that is an unbiased estimator of sigma 2 (n 1)si (n 1)s n2 2

Question: Continuation of Exercise 7-15. Suppose that both populations have the same variance; that is σ2/1 = σ2/2 = σ. Show that is an unbiased estimator

Continuation of Exercise 7-15. Suppose that both populations have the same variance; that is σ2/1 = σ2/2 = σ. Show that is an unbiased estimator of σ2.

(n-1)si + (n- 1)s

(n-1)si + (n- 1)s " + n2 - 2

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