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**Unformatted text preview: **= 2( C-2 D-4)(-2)+2( C-D-2)(-1)+0+2( C + D )(1)+2( C +2 D )(2) = 20 D +20 so we need to solve 5 C = 5, 10 D =-10 so C = 1 and D =-1. The line of best t is 1-t . 26 ) We are trying to solve C + D = 0, C + E = 1, C-D = 3 and C-E = 4, that is 1 1 1 1 1-1 1-1 = 1 3 4 . So A T A = 1 1 1 1 1 0-1 0 1-1 1 1 1 1 1-1 1-1 = 4 0 0 0 2 0 0 0 2 . Now A T ~ b = 8-3-3 So solving A T A~x = 8-3-3 gives ~x = 2-3 / 2-3 / 2 . The best plane is 2-(3 / 2) x-(3 / 2) y which at (0 , 0) gives 2, the average of 0, 1, 3 and 4....

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