Lesson_25_notes

Lesson_25_notes - 482 5 55 6 3 5 22 6 2 . ) ( ) ( ) )( ( )...

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Lesson 25: Least Squares Regression For (n) points, ( 29 ∑ ∑ - - = 2 2 x x n y x xy n m ( 29 ∑ ∑ - - = 2 2 2 x x n xy x y x b Ex. (-6, -2); (-3, 1), (0, 0); (0, -3); (1, -1), (3, -2) 1. Make x, y, xy, x 2 chart using points given and establish n (number of points given): n=6 2. Plug results into formulas:
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Unformatted text preview: 482 5 55 6 3 5 22 6 2 . ) ( ) ( ) )( ( ) (-=------= m m 902 5 55 6 22 5 3 55 2 . ) ( ) ( ) )( ( ) )( (-=------= b b 3. Plug into y=mx+b formula: y= -0.482x 0.902 x y xy x 2-6 2-12 36-3 1-3 9-3 1-1-1 1 3 2 6 9 -5-3-22 55...
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