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Figure 4.9 Graphs of 1 + 2x1 – x2 + x1x2 for x2 = 0,1,2

Figure 4.9 Graphs of 1 + 2x1 – x2 + x1x2 for x2 = 0,1,2

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Figure 4.10 Examples of nointeraction and interaction models

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Figure 4.11 MINITAB regression printout
for grandfather clock model with interaction

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Section 4.11
A Quadratic
(Second-Order)
Model with a
Quantitative
Predictor

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Figure 4.12 Graphs for two
quadratic models

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Figure 4.13 SPSS scatterplot for
data of Example 4.7

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Figure 4.14 SPSS output for
quadratic model of Example 4.7

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Figure 4.15 MINITAB graph of least
squares fit for the quadratic model

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Figure 4.16 Potential misuse of
quadratic model

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