Mathematical Modeling of the Bearing Ratio Curve Rmr (50% Rz), through Investigation of the Effect of Process Parameters in Hard Turning of Steel C55 (DIN) with Mixed Ceramics MC2 (Al₂O₃ + TiC)

Table 4

Correlation of the input–output information about the mathematical model.

A first-order mathematical model without interaction or assessment of the significance of the factors
Number of experiments	Calculated values; Rmr (%)	Predicted values Rmr (%)	Error (%)	95% Confidence interval
1	38.500	29.183	24.201	21.956–38.787
2	30.130	34.878	−15.757	26.241–46.357
3	25.870	23.987	7.281	18.047–31.881
4	28.000	28.667	−2.384	21.569–38.103
5	23.130	28.404	−22.802	21.370–37.752
6	51.030	33.947	33.476	25.541–45.120
7	29.030	23.346	19.578	17.565–31.030
8	28.230	27.902	1.160	20.993–37.086
9	33.500	36.366	−8.557	27.361–48.336
10	53.200	43.463	18.302	32.701–57.768
11	36.370	29.891	17.814	22.489–39.729
12	40.100	35.724	10.912	26.878–47.482
13	39.170	35.396	9.635	26.631–47.046
14	44.930	42.303	5.846	31.828–56.227
15	30.100	29.094	3.344	21.889–38.669
16	34.330	34.771	−1.285	26.161–46.215
17	25.970	31.855	−22.659	28.361–35.778
18	23.950	31.855	−33.004	28.361–35.778
19	24.300	31.855	−31.089	21.956–35.778
20	19.930	31.855	−59.832	26.241–35.000