Mathematical Analysis of the Effect of Iron and Silica on the Reduction Performance of Manganese Ores

Table 13

Effect of total iron (), silica (), and their interaction () on .

Source of variance	The average effect	Sum of square (SS)	Mean square (MS); (MS = SS/degree of freedom)	Magnitude effect,; (MSVariance/)
	−19	722	722	361
	−82	13448	13448	6724
	30	1800	1800	900
Error		8	2
Total		15978