Run no.

X1

X2

X3

Yield

Experimental

Predicted

1

0

0

0

95.359

95.359

2

0

0

-1.68

91.819

93.642

3

0

0

0

95.359

95.359

4

0

1.68

0

89.939

89.194

5

1.68

0

0

96.720

97.038

6

1

1

-1

95.226

94.591

7

-1

1

1

87.315

88.478

8

1

-1

1

91.848

92.118

9

0

0

0

95.359

95.359

10

0

0

1.68

91.371

89.548

11

-1

-1

1

87.098

87.733

12

0

0

0

95.359

95.359

13

-1.68

0

0

90.555

90.237

14

1

1

1

90.284

91.278

15

-1

-1

-1

90.289

89.295

16

0

0

0

95.359

95.359

17

0

-1.68

0

87.824

88.569

18

0

0

0

95.359

95.359

19

-1

1

-1

91.150

90.880

20

1

-1

-1

95.754

94.591

Table 3: Experimental and predicted data for the yield of biodiesel obtained from the central composite experimental design.