| Test | Leaves | Stem | Roots |
| N | 25 | 25 | 25 |
| Shapiro-Wilk W | 0.842 | 0.438 | 0.3351 |
| p(normal) | 3.217 × 10−9 | 9.652 × 10−9 | 1.246 × 10−9 |
| p (Monte Carlo) | 0.0001 | 0.0002 | 0.0001 |
| Conclusion: the three distribution are not Gaussian (normal). We must use a non-parametric test. | |||
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