. 2016 May 30;9(6):428. doi: 10.3390/ma9060428

Table 2.

Experimental designs of the five levels and their experimental results and predictive values.

Run Number	X₁ (H₂O₂)	X₂ (pH)	X₃ (Fe²⁺)	TOC Removal (%)
Run Number	X₁ (H₂O₂)	X₂ (pH)	X₃ (Fe²⁺)	Observed	Predicted
1	0.2	2.3	2	74.83	73.13
2	0.4	2.3	2	65.01	68.36
3	0.2	3.5	2	55.68	56.51
4	0.2	2.3	6	85.92	83.45
5	0.4	3.5	2	31.15	34.85
6	0.4	2.3	6	96.04	96.44
7	0.2	3.5	6	71.24	69.12
8	0.4	3.5	6	62.29	65.22
9	0.13	2.9	4	87.28	91.12
10	0.46	2.9	4	89.42	83.83
11	0.3	1.92	4	61.03	61.87
12	0.3	3.88	4	24.22	21.64
13	0.3	2.9	0.73	65.29	62.21
14	0.3	2.9	7.26	95.1	96.44
15	0.3	2.9	4	88.15	88.27
16	0.3	2.9	4	88.63	88.27
17	0.3	2.9	4	88.93	88.27
18	0.3	2.9	4	88.45	88.27
19	0.3	2.9	4	87.85	88.27
20	0.3	2.9	4	88.32	88.36