Study on Surface Hardness and Microstructure of Pure Copper Chip Strips Prepared by LSEM

Table 8

ANOVA analysis for surface hardness.

Source	Sum of square	Degree of freedom	Mean square	F ratio	value	Significance	Optimal level
D	302.5	2	151.248	20.565	0.046		D1
E	28.7	2	14.334	1.949	0.339	—	E1
F	57.6	2	28.804	3.917	0.203	—	F1
Error	14.7	2	7.354	—	—	—	—