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The observations are Y1, . . . , Yn. The model is Yi = ?xi...

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Basic Math

The observations are Y1, . . . , Yn. The model is Yi = ?xi + i ,i = 1, . . . , n, where (i) x1, . . . , xn are known constants, and(ii) 1, . . . , n are iid N(0, ?2 ). Find the MLEs of ? and ?^ 2 .Are they jointly sufficient for ? and ? ^2 ?

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