Homework7_solution

Homework7_solution - Homework 7 Due next Thursday#1 Exercise 12.2 and Exercise 12.17 The regression equation is y = 3.37 0.00362 x1 0.948 x2

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Unformatted text preview: Homework 7 Due next Thursday (3/29/2011) #1: Exercise 12.2 and Exercise 12.17 The regression equation is y = - 3.37 + 0.00362 x1 + 0.948 x2 Predictor Coef SE Coef T P Constant -3.3727 0.6360 -5.30 0.000 x1 0.0036167 0.0006121 5.91 0.000 x2 0.9476 0.3609 2.63 0.028 S = 0.406301 R-Sq = 82.3% R-Sq(adj) = 78.3% Analysis of Variance Source DF SS MS F P Regression 2 6.9008 3.4504 20.90 0.000 Residual Error 9 1.4857 0.1651 Total 11 8.3865 1651 . 2 = ∧ σ 1.0 0.5 0.0-0.5-1.0 99 95 90 80 70 60 50 40 30 20 10 5 1 Residual Percent Normal Probability Plot (response is y) 2.5 2.0 1.5 1.0 0.5 0.0-0.5 0.75 0.50 0.25 0.00-0.25-0.50 Fitted Value Residual Versus Fits (response is y) The data points in the normal probability plot approximately lie on the one line, but the residuals seem to have a quadratic relationship with the fitted values. After we add one additional random variable, x1*x2 and take off x1, the residuals look more random. 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0.4 0.3 0.2 0.1 0.0-0.1-0.2-0....
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This note was uploaded on 01/19/2012 for the course IEN 312 taught by Professor Qiu during the Spring '11 term at University of Miami.

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Homework7_solution - Homework 7 Due next Thursday#1 Exercise 12.2 and Exercise 12.17 The regression equation is y = 3.37 0.00362 x1 0.948 x2

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