Let S 2 be the sample variance of a random sample from a distribution with variance

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Let S2 be the sample variance of a random sample from a distribution with variance σ2 > 0. Since E(S2) = σ2, why isn’t E(S) = σ?

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Introduction To Mathematical Statistics

ISBN: 9780321794710

7th Edition

Authors: Robert V., Joseph W. McKean, Allen T. Craig

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