Table 5: Response surface methodology experiment design for clarity and response.

No.

X11

X12

X13

X14

Y2

1

240

3

1

30

83.00

2

200

3

1

30

89.86

3

240

1

1

30

81.95

4

200

1

1

30

88.25

5

220

2

1.5

40

86.56

6

220

2

0.5

40

85.29

7

220

2

1.5

20

85.52

8

220

2

0.5

20

84.38

9

220

2

1

30

86.03

10

240

2

1

40

82.10

11

200

2

1

40

91.40

12

240

2

1

20

82.17

13

200

2

1

20

88.60

14

220

3

1.5

30

87.14

15

220

1

1.5

30

84.97

16

220

3

0.5

30

85.63

17

220

1

0.5

30

84.19

18

220

2

1

30

85.93

19

240

2

1.5

30

82.94

20

200

2

1.5

30

90.34

21

240

2

0.5

30

82.77

22

200

2

0.5

30

88.24

23

220

3

1

40

86.05

24

220

1

1

40

86.00

25

220

3

1

20

86.37

26

220

1

1

20

82.30

27

220

2

1

30

85.90