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 Why is s2 the best point estimate of σ2 ? \text { Why is } s ^ { 2 } \text { the best point estimate of } \sigma ^ { 2 } \text { ? }

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 Why is s2 the best point estimate of σ2 ? \text { Why is } s ^ { 2 } \text { the best point estimate of } \sigma ^ { 2 } \text { ? }

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