Test	Roots AF	Roots AS	Roots HI
N	25	25	25
Shapiro–Wilk W	0.3351	0.4847	0.4686
p(normal)	1.246 × 10−9	2.65 × 10−8	1.858 × 10−8
p (Monte Carlo)	0.0001	0.0002	0.0001
Conclusion: the three distribution are not Gaussian (normal). We must use a non-parametric test.