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

Data originally from Vangel, M.~G. (1992). ``New methods for one-sided
tolerance limits for a one-way balanced random-effects {ANOVA} model.''
{\em Technometrics\/}~{\em 34}, 176--185.

Columns are batch number and (coded) tensile strength.