Study on Compaction of Reclaimed Soil of Nonmetallic Mining Area in Northern Foothills of Tianshan Mountains in Xinjiang, China

Table 6

Analytical results of the paired sample test.

Wilcoxon signed-rank test						Sign test
Rank		Mean rank	Sum of rank	Test statistics	The porosity after MP-the porosity before MP	Rank	N	Test statistics	The porosity after MP-the porosity before MP
Negative ranks	11	6.00	66.00	Z	−2.934	Negative ranks	11	Exact significance (2-sided)	0.001
Positive ranks	0	0	0	Asymptotic significance (2-sided)	0.003	Positive ranks	0
Tie	0					Tie	0
Total	11					Total	11

Note. MP: maintenance period.