Source

Sum of Squares

df

Mean Square

F value

p value

Model

1104.27

9

122.70

101.69

<0.0001 (Significant)

X₁-Ce doping

50.84

1

50.84

42.13

0.0003

X₂-Ce doping

7.03

1

7.03

5.83

0.0465

X₃-calcination temperature

102.72

1

102.72

85.14

<0.0001

X₁X₂

7.56

1

7.56

6.27

0.0408

X₁X₃

0.4444

1

0.4444

0..684

0.5631

X₂X₃

2.78

1

2.78

2.30

0.1730

$X_1^2$

22.19

1

22.19

18.39

0.0036

$X_2^2$

25.53

1

25.53

21.16

0.0025

$X_3^2$

845.53

1

845.53

700.78

<0.0001

Residual

8.45

7

1.88

Lack of Fit

5.42

3

1.81

2.39

0.2092 (Not significant)

Pure Error

3.02

4

0.7556

Cor Total

1112.72

16