Table 3. CCD of a Response Variable with Experimental and Theoretical Values.

	factor 1	factor 2	factor 3	factor 4	CGA content (μg/mL)
experiment	water content	solid–liquid ratio	ultrasonic power	ultrasonic time	experimental value	theoretical value
1	2	0	0	0	12.56	11.00
2	0	0	0	0	16.30	16.04
3	–1	1	1	1	18.82	18.59
4	1	1	–1	–1	13.17	11.96
5	0	0	0	0	15.31	16.04
6	–1	–1	1	1	14.09	12.78
7	–1	–1	1	–1	8.31	8.85
8	1	1	–1	1	14.33	15.05
9	1	–1	–1	–1	5.10	6.59
10	0	–2	0	0	5.98	6.26
11	–1	1	–1	1	18.35	18.25
12	0	0	2	0	13.94	13.75
13	0	0	0	2	15.80	15.34
14	–1	–1	–1	1	10.38	9.65
15	–1	1	1	–1	16.42	14.78
16	1	1	1	–1	10.61	12.60
17	0	0	0	0	17.37	16.04
18	1	–1	–1	1	10.67	9.79
19	0	0	0	–2	6.58	8.32
20	1	–1	1	1	8.17	11.28
21	0	0	0	0	15.94	16.04
22	1	–1	1	–1	12.44	10.01
23	0	0	–2	0	8.53	9.98
24	–1	–1	–1	–1	5.41	3.80
25	0	0	0	0	16.05	16.04
26	1	1	1	1	14.69	13.77
27	–2	0	0	0	10.20	13.03
28	0	0	0	0	15.28	16.04
29	0	2	0	0	16.45	17.44
30	–1	1	–1	–1	14.36	12.50