Question: n n Given data for a least-squares problem, (x, y( ). . .. (*n.yn) , the abbreviations _x = _ x )>? = > x2.

n n Given data for a least-squares problem, (x, y( ). . .. (*n.yn) , the abbreviations _x = _ x )>? = > x2. 1=1 i=1 n n [y= [ y, and Exy= _ x;y, are important. The normal equations for a least-squares line y = Po + B, x are shown i=1 1 = 1 below. Derive the normal equations from the matrix form XB = y. n Bo + By Ex = Ey Bo Ex + B, Ex? = Exy 1 X1 y1 Po In the equation XB = y, X = B= and y = The normal equation from XB =y is 61 X y

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