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. |