Effect

SS

Degrees of freedom

MS

F

p

Model

78.093

1

78.093

94.629

0.000002

X₁

189.535

1

189.535

229.668

0

1250.05

1

1250.05

1514.743

0

X₂

78.029

1

78.029

94.552

0.000002

77.268

1

77.268

93.63

0.000002

X₃

7.432

1

7.432

9.006

0.01332

35.757

1

35.757

43.329

0.000062

X₁X₂

4.53

1

4.53

5.489

0.041134

X₁X₃

4.033

1

4.033

4.887

0.050509

X₂X₃

0.168

1

0.168

0.204

0.661291

Lack of fit

8.253

10

0.825