Statistics Homework Solutions 196

Statistics Homework Solutions 196 - Coef StDev T P Constant...

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196 CHAPTER 8 9. (a) SSE full 7 7302, SSE reduced 7 7716, n 165, p 7, k 4. F SSE reduced SSE full p k SSE full n p 1 0 2803. (b) 3 degrees of freedom in the numerator and 157 in the denominator. (c) P 0 10 (a computer package gives P 0 840). The reduced model is plausible. (d) This is not correct. It is possible for a group of variables to be fairly strongly related to an independent variable, even though none of the variables individually is strongly related. (e) No mistake. If y is the dependent variable, then the total sum of squares is y i y 2 . This quantity does not involve the independent variables. 11. (a) Predictor
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Unformatted text preview: Coef StDev T P Constant 0.087324 0.16403 0.53237 0.597 x 0.52203 0.055003 9.4909 0.000 x 2 02333 0.0043235 5 396 0.000 (b) Predictor Coef StDev T P Constant 0.19878 0.11677 1.7023 0.096 ln x 1.2066 0.068272 17.673 0.000 (c) 1 2 3 4-1-0.5 0.5 1 Fitted Value Residual Quadratic Model 1 2 3 4-1-0.5 0.5 1 Fitted Value Log Model Neither residual plot reveals gross violations of assumptions. (d) Quadratic Model Log Model x Prediction Prediction 3.0 1.44 1.52 5.0 2.11 2.14 7.0 2.60 2.55 9.0 2.90 2.85...
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