Table 4.

Range and variance analysis data of forming precision

Type of data processing	Factor A	Factor B	Factor C
Range analysis
k1	91.79	90.45	88.22
k2	95.57	93.34	94.91
k3	91.68	95.24	95.91
Range	3.90	4.79	7.69
Sequence	C>B>A
Optimal levels	A2	B3	C3
Optimal combination	A2B3C3
Variance analysis
Mean-square value	16.06	19.00	56.93
F value	1.25	1.48	4.44
Significance level (P value)	---(0.444)	---(0.403)	---(0.184)