mont4e_sm_ch14_sec04 - Section 14-4 14-11 Parts a) and b)...

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Unformatted text preview: Section 14-4 14-11 Parts a) and b) Analysis of Variance for strength Source DF SS hardwood 2 8.3750 MS 4.1875 F 7.64 P 0.003 14-13 cookingtime 1 freeness 2 hardwood*cookingtime 2 hardwood*freeness 4 cookingtime*freeness 2 Error 22 Total 35 17.3611 21.8517 3.2039 6.5133 1.0506 12.0644 70.4200 17.3611 10.9258 1.6019 1.6283 0.5253 0.5484 31.66 19.92 2.92 2.97 0.96 0.000 0.000 0.075 0.042 0.399 All main factors are significant. The interaction of hardwood*freeness is also significant. c) The residual plots do not indicate serious problems with normality or equality of variance. Normal Probability Plot of the Residuals (response is strength) 2 Normal Score 1 0 -1 -2 -1 0 1 Residual Residuals Versus freeness (response is strength) Residuals Versus cookingt (response is strength) 1 1 Residual 0 Residual 400 450 500 550 600 650 0 -1 -1 1.5 1.6 1.7 1.8 1.9 2.0 freeness cookingt Residuals Versus hardwood (response is strength) Residuals Versus the Fitted Values (response is strength) 1 1 Residual Residual 10 15 20 0 0 -1 -1 96 97 98 99 100 101 hardwood Fitted Value ...
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