Chapter Principles of Model Building Copyright © 2012 Pearson Education, Inc All rights reserved Section 5.1 Introduction: Why Model Building Is Important Copyright © 2012 Pearson Education, Inc All rights reserved Section 5.2 The Two Types of Independent Variables: Quantitative and Qualitative Copyright © 2012 Pearson Education, Inc All rights reserved Section 5.3 Models with a Single Quantitative Independent Variable Copyright © 2012 Pearson Education, Inc All rights reserved Figure 5.1 Modeling exam score, y, as a function of study time, x Copyright © 2012 Pearson Education, Inc 5- Copyright © 2012 Pearson Education, Inc 5- Copyright © 2012 Pearson Education, Inc 5- Copyright © 2012 Pearson Education, Inc 5- Figure 5.2 Graphs for two second-order polynomial models Copyright © 2012 Pearson Education, Inc 5- Figure 5.3 Example of the use of a quadratic model Copyright © 2012 Pearson Education, Inc 5- 10 Copyright © 2012 Pearson Education, Inc 5- 50 Figure 5.22 SAS printout for main effects model, Example 5.10 Copyright © 2012 Pearson Education, Inc 5- 51 Figure 5.23 SAS printout for interaction model, Example 5.10 Copyright © 2012 Pearson Education, Inc 5- 52 Figure 5.24 MINITAB graph of sample means for engine performance Copyright © 2012 Pearson Education, Inc 5- 53 Figure 5.25 SAS printout for nested model F-test of interaction Copyright © 2012 Pearson Education, Inc 5- 54 Section 5.9 Models with Three or More Qualitative Independent Variables Copyright © 2012 Pearson Education, Inc All rights reserved Copyright © 2012 Pearson Education, Inc 5- 56 Section 5.10 Models with Both Quantitative and Qualitative Independent Variables Copyright © 2012 Pearson Education, Inc All rights reserved Figure 5.26 Model for E(y) as a function of engine speed Copyright © 2012 Pearson Education, Inc 5- 58 Figure 5.27 Model for E(y) as a function of fuel type and engine speed (no interaction) Copyright © 2012 Pearson Education, Inc 5- 59 Figure 5.28 Graph of E(y) as a function of fuel type and engine speed (interaction) Copyright © 2012 Pearson Education, Inc 5- 60 Figure 5.29 A graphical portrayal of three factors - two qualitative and one quantitative - on DDT level Copyright © 2012 Pearson Education, Inc 5- 61 Figure 5.30 DDT curves for stages and Copyright © 2012 Pearson Education, Inc 5- 62 Section 5.11 External Model Validation (Optional) Copyright © 2012 Pearson Education, Inc All rights reserved Figure 5.31 MINITAB printout for the multiplicative model of executive salary Copyright © 2012 Pearson Education, Inc 5- 64 ... Pearson Education, Inc All rights reserved Section 5.3 Models with a Single Quantitative Independent Variable Copyright © 2012 Pearson Education, Inc All rights reserved Figure 5.1 Modeling... 5.1 Introduction: Why Model Building Is Important Copyright © 2012 Pearson Education, Inc All rights reserved Section 5.2 The Two Types of Independent Variables: Quantitative and Qualitative... 2012 Pearson Education, Inc 5- 13 Figure 5.5 MINITAB scatterplot for power load data Copyright © 2012 Pearson Education, Inc 5- 14 Figure 5.6 MINITAB output for third-order model of power load Copyright