Design and Test of Combined Air Suction Cotton Breed Seeder

Table 4

Variance analysis of multiples index.

Source of variance	Quadratic sum	Degree of freedom	Mean square error	F	P
Model	24.64	9	2.74	10.54	0.0026
X1	4.06	1	4.06	15.64	0.0055
X2	7.61	1	7.61	29.29	0.001
X3	5.95	1	5.95	22.92	0.002
X1X2	0.64	1	0.64	2.46	0.1604
X1X3	0.0025	1	0.0025	0.0096	0.9246
X2X3	0.09	1	0.09	0.3466	0.5745
	2.29	1	2.29	8.82	0.0208
	2.14	1	2.14	8.23	0.024
	1.22	1	1.22	4.69	0.0672
Residual error	1.82	7	0.2596
Lack of fit	1.82	3	0.6058
Error	0	4	0
Total	26.46	16

Significant difference (). Extremely significant difference ().