Table 11. ANOVA Result for D.

factors	degree of freedom	sum of squares	variance	F-test	contribution (%)	rank
IP	2	31968.519	15984.259	3.433	11.392	2
IT	2	4758.296	2379.148	0.511	1.696	6
PL	2	19891.185	9945.593	2.136	7.088	3
MT	2	127586.074	63793.037	13.699	45.466	1
HP	2	14268.074	7134.037	1.532	5.085	5
IS	2	16949.407	8474.704	1.820	6.040	4
error	14	65194.074	4656.720		23.233
sum	26	280615.630