Question: 4. Suppose that S2 1 and S2 2 are sample variances of two samples of n1 and n2 independent observations, respectively, from a population with

4. Suppose that S2 1 and S2 2 are sample variances of two samples of n1 and n2 independent observations, respectively, from a population with mean μ and variance σ2. Determine an unbiased estimator of σ2 as a combination of S2 1 and S2 2 .

8.3 Interval Estimators for the Mean μ of a Normal Population 301

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