p4.20 data frame has 26 observations
on a designed experiment to determine the influence
of five factors on the whiteness of rayon.
This data frame contains the following columns:
acid bath temperature
cascade acid concentration
amount of chlorine bleach
a measure of the whiteness of rayon
Montgomery, D.C., Peck, E.A., and Vining, C.G. (2001) Introduction to Linear Regression Analysis. 3rd Edition, John Wiley and Sons.
Myers and Montgomery (1995) Response Surface Methodology, pp. 267-268.
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