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Table 4
Initial ANOVA for fatigue strength.
| Source | DF | Sum of squares | Mean Squares | F-Value | P-Value | Decision |
|---|---|---|---|---|---|---|
| Model | 14 | 66.6498 | 4.7607 | 37.21 | 0.000 | Statistically significant |
| A | 1 | 2.2126 | 2.2126 | 17.29 | 0.001 | Statistically significant |
| B | 1 | 13.3056 | 13.3056 | 104.00 | 0.000 | Statistically significant |
| C | 1 | 5.1745 | 5.1745 | 40.44 | 0.000 | Statistically significant |
| D | 1 | 0.5134 | 0.5134 | 4.01 | 0.065 | Negligibly small |
| A*A | 1 | 0.0090 | 0.0090 | 0.07 | 0.795 | Negligibly small |
| B*B | 1 | 3.0281 | 3.0281 | 23.67 | 0.000 | Statistically significant |
| C*C | 1 | 24.7528 | 24.7528 | 193.47 | 0.000 | Statistically significant |
| D*D | 1 | 0.5034 | 0.5034 | 3.93 | 0.067 | Negligibly small |
| A*B | 1 | 2.3661 | 2.3661 | 18.49 | 0.001 | Statistically significant |
| A*C | 1 | 4.6010 | 4.6010 | 35.96 | 0.000 | Statistically significant |
| A*D | 1 | 0.2141 | 0.2141 | 1.67 | 0.217 | Negligibly small |
| B*C | 1 | 0.7140 | 0.7140 | 5.58 | 0.033 | Statistically significant |
| B*D | 1 | 0.8100 | 0.8100 | 6.33 | 0.025 | Statistically significant |
| C*D | 1 | 1.3924 | 1.3924 | 10.88 | 0.005 | Statistically significant |
| Error | 14 | 1.7912 | 0.1279 | Negligibly small | ||
| Lack-of-Fit | 10 | 1.3235 | 0.1323 | 1.13 | 0.492 | Statistically significant |
| Pure Error | 4 | 0.4677 | 0.1169 | |||
| Total | 28 | 68.4410 |
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