Statistics Homework Solutions 200

Statistics Homework Solutions 200 - 200 CHAPTER 8 £(b We...

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Unformatted text preview: 200 CHAPTER 8 £ (b) We drop the interaction term Speed Pause. StDev 0.23213 0.022223 0.01260 0.00048658 0.0002419 R-sq(adj) = 90.7% 0 77, P ¡ ¥ ¤ ©¥ £ ¡ ¨ ¡ £ 2 7307 P 0.000 2 6462 5 4 2 6462 24 0 390 (the same as the P-value for the dropped variable). ¨ ¤ ¡ ¨ Comparing this model with the one in part (a), F1 24 ¡ ¨ ¡ puter package gives P F 71.454 ¨ MS 7.8049 0.10923 ¡ SS 31.22 2.7307 33.95 0 10. A com¨ ¨ ¡ ¡ Analysis of Variance Source DF Regression 4 Residual Error 25 Total 29 P 0.000 0.001 0.000 0.031 0.000 ¨ ¨ R-sq = 92.0% ¡ S = 0.33050 T 47.246 3 5961 10 518 2.2809 6.9185 ¡ Coef 10.967 0 079919 0 13253 0.0011098 0.0016736 ¨ Predictor Constant Speed Pause Speed2 Pause2 1 (c) Residual 0.5 There is a some suggestion of heteroscedasticity, but it is hard to be sure without more data. 0 −0.5 11 ¡ ¡ 10 6. P 0.000 2 6462 5 2 6462 24 ¨ 73 ¤ ¨ ¡ computer package gives P 7 8405 ¨ Comparing this model with the one in part (a), F3 24 F 44.957 £ MS 13.055 0.29039 ¡ SS 26.11 7.8405 33.95 R-sq(adj) = 75.2% ¨ Analysis of Variance Source DF Regression 2 Residual Error 27 Total 29 P 0.000 0.000 0.000 ¤ ¥ £ R-sq = 76.9% T 45.601 -6.4507 4.2431 ¡ S = 0.53888 StDev 0.21842 0.020545 0.00039442 2 ¥ Coef 9.9601 -0.13253 0.0016736 ¡ Predictor Constant Pause Pause2 10 15 70, P ¨ 8 9 Fitted Value ¡ (d) 7 0 001. A ¨ −1 6 ...
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