Source of Variance Sum of Squares Degree of Freedom Mean Squares F Ftab Regression 1275.13 1 1275.13 43.6 5.12 Residual 263.42 9 29.27     Lack of Fit 163.63 6       Pure error 99.79 3       Total 1538.75 10

Table 2: ANOVA for 23 factorial design on viability.