Research on Compressive Tests of Iron Tailing and Cement-Modified Earth Materials from Northwest China

Table 4

Analysis of formula test frequency of iron tailings and cement-modified earth materials.

Level	X1		X2		X3
	Number	Frequency	Number	Frequency	Number	Frequency
0	4	0.363	0	0	6	0.545
0.1	2	0.182	0	0	1	0.091
0.2	0	0	1	0.091	1	0.091
0.3	0	0	1	0.091	1	0.091
0.4	1	0.091	1	0.091	1	0.091
0.5	1	0.091	2	0.182	1	0.091
0.6	1	0.091	2	0.182	0	0
0.7	1	0.091	1	0.091	0	0
0.8	1	0.091	2	0.182	0	0
0.9	0	0	1	0.091	0	0
1	0	0	0	0	0	0
Weighted mean	0.291		0.573		0.136
Standard error	0.095		0.066		0.056
95% confidence interval	0.105–0.477		0.444–0.703		0.027–0.246
Actual proportion of each component	0.121–0.195		0.139–0.191		0.655–0.699