5.1 Analyse the wafer data of Table C.1 not just graphically but also analytically.

Use the analytical method you are used to and prefer (e.g. the PRESS value, the predictive R2, or the p values from F tests and any appropriate method, e.g.

stepwise regression, in the selection of terms to include). Will the conclusions differ from those of the normal probability plot (Figure 5.3)?