Applying the SS decomposition with the projection matrix for the null model (Section 2.3.1), use Cochrans theorem

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Applying the SS decomposition with the projection matrix for the null model

(Section 2.3.1), use Cochran’s theorem to show that for y1,…, yn independent from N(????, ????2), ȳ and s2 are independent (Cochran 1934).

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