Suppose you had fitted a second-order model by least


Suppose you had fitted a ·second-order model by least squares with a three factor central composite design with axial and center points duplicated and obtained the following partial ANOVA table:

2226_design with axial and center points.png

(a) Complete the ANOVA table.

(b) Is there evidence of lack of fit of the fitted model?

(c) Do you think the model is well enough estimated to justify further analysis?

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Basic Statistics: Suppose you had fitted a second-order model by least
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