Y_yield

Coefficient

Degree of freedom

F-value

p-Value

X₁: Amount of Cellulose

−0.0622

1

0.13

0.7255

X₂: Sulfuric acide Concentration

4.9715

1

675.83

0.0000

X₃: Hydrolysis Time

3.4497

1

27.7

0.0000

X₄: Hydrolysis Temperature

2.5453

1

308.96

0.0000

X₅: Sonication Time

−0.3670

1

2.72

0.1105

$X_1^2$

0.1515

1

0.6

0.4464

X₁X₂

0.0018

1

0

0.9603

X₁X₃

0.0026

1

0.06

0.8145

X₁X₄

−0.0020

1

0.01

0.9266

X₁X₅

−0.0031

1

0.8

0.3798

$X_2^2$

−0.0104

1

1.76

0.1957

X₂X₃

−0.0842

1

14.6

0.0007

X₂X₄

−0.0588

1

180.25

0.0000

$X_3^2$

0.0015

1

2.49

0.1260

X₃X₄

0.0017

1

1.55

0.2232

$X_4^2$

−0.0029

1

0.9

0.3517

$X_5^2$

0.0642

1

27.45

0.0000

Lack-of-Fit Test

-

22

1.02

0.5505

Pure error

-

5

-

-