The data in Table 9.27 deal with how the quality of steel, measured by ELAST, an index of quality, is affected by two aspects of the processing procedure: CLEAN: concentration of a cleaning agent, and...

The data in Table 9.27 deal with how the quality of steel, measured by ELAST, an index of quality, is affected by two aspects of the processing procedure:

CLEAN: concentration of a cleaning agent, and

TEMPR: an index of temperature and pressure.

The experiment is a 5
 5 factorial with three independently drawn experimental units for each of the 25 factor level combinations. The factor levels are numeric but equally spaced for only one factor.