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Exercises:  
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   Below are some common questions and answers
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   A number linear models drawn as 3D-graphs (Minitab macro %LinModel)
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29. Design of Experiments (DoE) — some basic features

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Show/hide true model

Y

X1

-1

+1

Table of measured results (Y)

X1 high (+1)

X1 low (-1)

X2 low (-1)

X2 high (+1)

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Change of parameters in the model

β0

β1

β2

β3

σ (error)