A data set from Oehlert (2000) \emph{A First Course in Design and Analysis of Experiments}, New York: W. H. Freeman. Data originally from Draper, N.~R., T.~P. Davis, L.~Pozueta, and D.~M. Grove (1994). ``Isolation of degrees of freedom for Box-Behnken designs.'' {\em Technometrics\/}~{\em 36}, 283--291. An experiment to determine how a gasoline engine responds to various factors. Response is CO emissions in g/h. Factors are: column 1 engine load, in Newton meters, range (30,70) column 2 engine speed, in rpm, range (1000, 4000) column 3 spark advance, in degrees, range (10, 30) column 4 air-to-fuel ratio, dimensionless, range (13, 16.4) column 5 exhaust gas recycle, in percent, range (0, 10) column 6 indicates block column 7 is response