Table 7.

Hypotheses testing.

	Original Sample (O)	Sample Mean (M)	Standard Deviation	T-Statistics	P-Values
Designer	0.274	0.277	0.036	7.577	0.000
Contract Document	0.315	0.313	0.043	7.282	0.000
Owner	0.121	0.121	0.049	2.461	0.014
Knowledge	0.100	0.100	0.031	3.243	0.001
Regulation	0.123	0.125	0.038	3.206	0.001
Tools	0.097	0.098	0.046	2.129	0.034