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Table 5

Final ANOVA for fatigue strength.

Source DF Sum of squares Mean squares F-value P-value Decision
Model 11 65.8964 5.9906 40.02 0.000 Statistically significant
A 1 3.0261 3.0261 20.22 0.000 Statistically significant
B 1 13.3056 13.3056 88.89 0.000 Statistically significant
C 1 5.1745 5.1745 34.57 0.000 Statistically significant
D 1 0.4508 0.4508 3.01 0.101 Negligibly small
B*B 1 3.3117 3.3117 22.13 0.000 Statistically significant
C*C 1 25.4646 25.4646 170.12 0.000 Statistically significant
A*B 1 2.3661 2.3661 15.81 0.001 Statistically significant
A*C 1 4.6010 4.6010 30.74 0.000 Statistically significant
B*C 1 0.7140 0.7140 4.77 0.043 Statistically significant
B*D 1 0.8100 0.8100 5.41 0.033 Statistically significant
C*D 1 1.3924 1.3924 9.30 0.007 Statistically significant
Error 17 2.5446 0.1497     Negligibly small
Lack-of-Fit 13 2.0769 0.1598 1.37 0.414 Statistically significant
Pure Error 4 0.4677 0.1169      
Total 28 68.4410