R.D. Snee (Experimenting with a Large Number of Variables, in Experiments in Industry: Design, Analysis and Interpretation
Question:
(a) Prepare a normal probability plot of the effects. Which effects seem active? Fit a model using these effects.
(b) Calculate the residuals for the model you fit in part (a). Construct a normal probability plot of the residuals and plot the residuals versus fitted values. Comment on the plots.
(c) If any factors are negligible, collapse the 25-1 design into a full factorial in the active factors. Comment on the resulting design and interpret the results.
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Related Book For
Introduction to Statistical Quality Control
ISBN: 978-1118146811
7th edition
Authors: Douglas C Montgomery
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