Table 3.

Standard uncertainty from inhomogeneity (SU_bb)

Concentration	Source of variation	SS	df	MS	F	p-value	SUbb (mg%)	Ubb of conc. (%)
Low	Between groups	7.5976	9	0.8442	1.2301	0.3736	±0.2810	1.00
	Within groups	6.8623	10	0.6862
	Total	14.4599	19	(ubb)
Medium	Between groups	1.9173	9	0.2130	0.4416	0.9013	±0.3402	0.51
	Within groups	5.1758	10	0.5176
	Total	7.0931	19	(u’bb)
High	Between groups	23.2574	9	2.5842	2.7235	0.0672	±0.9042	0.67
	Within groups	9.4883	10	0.9488
	Total	32.7457	19	(ubb)

Abbreviations: SS represents the sum of squares; df denotes the degrees of freedom; MS indicates the mean squares; F is the F ratio; SU_bb is the standard uncertainty due to inhomogeneity; U_bb is the uncertainty due to inhomogeneity.