Descriptive Statistics of Natural Log-Transformed Data
Variables	Mean	Std. Error	Std. Deviation	Skewness	Kurtosis	Z-Test		Shapiro-Wilk
Variables	Mean	Std. Error	Std. Deviation	Skewness	Kurtosis	Skewness	Kurtosis	Statistic	p-value
Ni	5.524	0.22732	0.937	0.013	−0.292	0.024	−0.275	0.978	0.931
Pb	0.498	0.06839	0.282	−0.106	−0.656	−0.193	−0.617	0.986	0.993
Cd	0.443	0.04026	0.166	−0.022	−0.666	−0.040	−0.627	0.952	0.490
Mn	0.498	0.06839	0.282	−0.106	−0.656	−0.193	−0.617	0.986	0.993
Cu	3.930	0.16937	0.698	0.118	0.113	0.215	0.106	0.981	0.968
Zn	3.942	0.10676	0.440	−0.010	−0.548	−0.018	−0.516	0.962	0.662
Cr	6.468	0.26747	1.103	0.541	−0.926	0.984	−0.871	0.922	0.158
Ti	6.786	0.1014	0.418	0.343	−0.617	0.624	−0.580	0.966	0.744
V	61.139	5.85513	24.141	0.924	1.783	1.680	1.677	0.936	0.273
Fe	11.016	0.14248	0.587	0.372	−0.017	0.676	−0.016	0.977	0.919
As	1.226	0.22531	0.929	−0.309	−1.425	−0.562	−1.341	0.915	0.119