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Table 2 CCD plan of coded value, the observed value and predicted value

From: Improvement of antibiotic activity of Xenorhabdus bovienii by medium optimization using response surface methodology

Run

X 1

X 2

X 3

Observed value (U/mL)

Predicted value (U/mL)

Residual

1

1

1

1

305.0

300.59440

4.40560

2

1

1

-1

270.0

269.50019

0.49981

3

1

-1

1

266.7

263.28293

3.41707

4

1

-1

-1

271.7

264.68872

7.01128

5

-1

1

1

280.0

278.74159

1.25841

6

-1

1

-1

250.0

245.14737

4.85263

7

-1

-1

1

241.7

233.93012

7.76988

8

-1

-1

-1

236.7

232.83590

3.86410

9

1.682

0

0

285.0

290.12933

-5.12933

10

-1.682

0

0

238.4

244.96290

-6.56290

11

0

1.682

0

290.0

292.56256

-2.56256

12

0

-1.682

0

241.7

250.82967

-9.12967

13

0

0

1.682

256.7

262.73135

-6.03135

14

0

0

-1.682

230.0

235.66088

-5.66088

15

0

0

0

280.0

291.33368

-11.33368

16

0

0

0

296.7

291.33368

5.36632

17

0

0

0

300.0

291.33368

8.66632

18

0

0

0

283.3

291.33368

-8.03368

19

0

0

0

290.0

291.33368

-1.33368

20

0

0

0

300.0

291.33368

8.66632