Table 3.

The observed (Y) and the predicted values of the response

Run no	Uncoded values				Coded values				qe (mg/g)
	X1	X2	X3	X4	X1	X2	X3	X4	Observed values (Y)	Predicted values
1	6	120	2.0	600	0	0	0	0	180.446	180.502
2	5	90	1.5	500	− 1	− 1	− 1	− 1	166.855	168.783
3	7	90	1.5	500	+ 1	− 1	− 1	− 1	179.891	179.258
4	5	150	1.5	500	− 1	+ 1	− 1	− 1	169.303	174.255
5	7	150	1.5	500	+ 1	+ 1	− 1	− 1	191.400	188.361
6	5	90	2.5	500	− 1	− 1	+ 1	− 1	158.227	151.758
7	7	90	2.5	500	+ 1	− 1	+ 1	− 1	162.345	162.244
8	5	150	2.5	500	− 1	+ 1	+ 1	− 1	152.231	153.569
9	7	150	2.5	500	+ 1	+ 1	+ 1	− 1	163.912	167.687
10	5	90	1.5	700	− 1	− 1	− 1	+ 1	172.923	179.188
11	7	90	1.5	700	+ 1	− 1	− 1	+ 1	181.837	180.682
12	5	150	1.5	700	− 1	+ 1	− 1	+ 1	178.071	178.529
13	7	150	1.5	700	+ 1	+ 1	− 1	+ 1	185.185	192.654
14	5	90	2.5	700	− 1	− 1	+ 1	+ 1	158.067	161.583
15	7	90	2.5	700	+ 1	− 1	+ 1	+ 1	175.970	172.088
16	5	150	2.5	700	− 1	+ 1	+ 1	+ 1	164.670	166.264
17	7	150	2.5	700	+ 1	+ 1	+ 1	+ 1	181.996	180.401
18	4	120	2.0	600	− α	0	0	0	172.693	171.564
19	8	120	2.0	600	+ α	0	0	0	199.592	196.176
20	6	60	2.0	600	0	− α	0	0	154.269	160.107
21	6	180	2.0	600	0	+ α	0	0	180.226	173.891
22	6	120	1.0	600	0	0	− α	0	186.127	183.538
23	6	120	3.0	600	0	0	+ α	0	152.103	154.259
24	6	120	2.0	400	0	0	0	− α	159.911	160.250
25	6	120	2.0	800	0	0	0	+ α	175.079	174.369
26	6	120	2.0	600	0	0	0	0	180.132	180.502
27	6	120	2.0	600	0	0	0	0	180.540	180.170
28	5	90	1.5	500	− 1	− 1	− 1	− 1	166.792	168.452
29	7	90	1.5	500	+ 1	− 1	− 1	− 1	179.975	178.927
30	5	150	1.5	500	− 1	+ 1	− 1	− 1	169.429	173.923
31	7	150	1.5	500	+ 1	+ 1	− 1	− 1	191.400	188.030
32	5	90	2.5	500	− 1	− 1	+ 1	− 1	158.187	151.426
33	7	90	2.5	500	+ 1	− 1	+ 1	− 1	162.305	161.912
34	5	150	2.5	500	− 1	+ 1	+ 1	− 1	152.261	153.238
35	7	150	2.5	500	+ 1	+ 1	+ 1	− 1	163.952	167.355
36	5	90	1.5	700	− 1	− 1	− 1	+ 1	173.049	169.857
37	7	90	1.5	700	+ 1	− 1	− 1	+ 1	181.293	180.351
38	5	150	1.5	700	− 1	+ 1	− 1	+ 1	177.945	178.198
39	7	150	1.5	700	+ 1	+ 1	− 1	+ 1	185.311	192.323
40	5	90	2.5	700	− 1	− 1	+ 1	+ 1	158.142	161.252
41	7	90	2.5	700	+ 1	− 1	+ 1	+ 1	176.070	171.757
42	5	150	2.5	700	− 1	+ 1	+ 1	+ 1	164.595	165.933
43	7	150	2.5	700	+ 1	+ 1	+ 1	+ 1	181.846	180.070
44	4	120	2.0	600	− α	0	0	0	172.599	171.232
45	8	120	2.0	600	+ α	0	0	0	191.400	195.844
46	6	60	2.0	600	0	− α	0	0	154.175	159.776
47	6	180	2.0	600	0	+ α	0	0	180.132	173.560
48	6	120	1.0	600	0	0	− α	0	185.939	183.206
49	6	120	3.0	600	0	0	+ α	0	152.229	153.927
50	6	120	2.0	400	0	0	0	− α	159.879	159.918
51	6	120	2.0	800	0	0	0	+ α	175.173	174.037
52	6	120	2.0	600	0	0	0	0	180.226	180.170