2 Suppose that Y₁,..., Y, are independent and follow the distribution N(μ, σ²), where μ Є R and σ² < ∞ are are unknown parameters. Let us study the ML estimator 0² (Y) Σ(YY)² (from page 34) for the parameter o². Calculate the expected value E。(σ² (Y)) i of the estimator 02 (Y) and use this to determine that it is not an unbiased estimator = n 1

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