By the method of least squares, fit the regression plane y = β1 + β2x1 + β3x2 to the following 12 observations of (x1, x2, y): (1, 1, 6), (0, 2, 3), (3, 0, 10), (–2, 0, –4), (–1, 2, 0), (0, 0, 1), (2, 1, 8), (–1, –1, –2), (0, –3, –3), (2, 1, 5), (1, 1, 1), (–1, 0, –2).
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