Test	Leaves AF	Leaves AS	Leaves HI
N	25	25	25
Shapiro–Wilk W	0.842	0.2534	0.2256
p(normal)	3.217 × 10−9	2.845 × 10−10	1.764 × 10−10
p (Monte Carlo)	0.0001	0.0001	0.0001
Conclusion: The three distribution are not Gaussian (normal). We must use a non-parametric test.