Table 5. Results of χ²-tests for each property.

Properties	χ2-Test		The overlap area in density plot
	Test statistic	P value
Ratio of soil particle less than 0.075 mm	7.983*	0.092	0.800
Ratio of soil particle less than 0.002 mm	6.809	0.146	0.657
Wet unit weight	8.682*	0.070	0.692
Void ratio	4.610	0.330	0.783
Permeability	1.238	0.872	0.679
Cohesion	8.271*	0.082	0.812
Internal friction angle	15.886***	0.003	0.642
Soil layer thickness	4.161	0.385	0.774
Weathered rock layer thickness	83.487***	<0.001	0.405
Bed rock layer thickness	80.855***	<0.001	0.388
Number of major anomaly zones	29.990***	<0.001	0.548

p<0.1
p<0.05
p<0.01