A data set from Oehlert (2000) \emph{A First Course in Design and
Analysis of Experiments}, New York: W. H. Freeman.

Data originally from Nelson, P.~R. (1993). ``Additional uses for the
analysis of means and extended tables of critical values.''
{\em Technometrics\/}~{\em 35}, 61--71.

Columns are computer, treatment, and response.