Question: Let three random samples of sizes n = 20, n = 10, and w;= 8 be taken from a population with mean and variance .

Let three random samples of sizes n = 20, n = 10, and w;= 8 be taken from a population with mean and variance . Let S., S. and S be the sample variances. Show that (205+105 +85/38 is an unbiased estimator of a

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