Question: (1) For multiple linear regression, In our cases, X = ( 2 2 3 ? ? 1 matrix. -1 B = (X'X)X? -1 B

(1) For multiple linear regression, In our cases, X = ( 2 2 3 ? ? 1 matrix. -1 B = (X'X)X? -1 B = (XX) X ? = X' ? = (2) ? X'X = ? = [1 ] and also ( X'X) = [1] ? ?=1 = ? (? ?=1 ? ? 2 ...... ? 2 (? (? 2??^ - +1) + ? ?=1 ? which is an n x 1 matrix and hence X' is 1 x n 2)' ? ? ? ? ?=1 ? ?

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