Table 1.

Descriptive statistics for groups.

				95% Confidence Interval for Mean
SBS(MPa)	n	Mean±Std.Dev.	Std. Error	Lower Bound	Upper Bound	Min.(MPa)	Max.(MPa)
Group I	10	3.498±0.75	.7516	2.960	4.036	1.62	4.32
Group II	10	6.182±1.98	.6264	4.765	7.599	3.71	10.73
Group III	10	11.19±0.92	.2940	12.52	13.85	11.89	14.53
Group IV	10	10.75±1.61	.5101	9.596	11.90	7.89	13.01
Group V	10	12.27±1.63	.5159	11.10	13.44	9.89	14.08
Group VI	10	9.489±1.16	.3695	8.653	10.32	7.61	11.25
Group VII	10	7.829±1.49	.4718	6.762	8.896	5.96	10.40