Table 5 Table of analysis of variance for quadratic model of gas drainage volume in the roof low roadway.

From: Study on the optimal position of the roof low roadway based on the response surface methodology

Source

Degree of freedom

Mean square

F-valve

P-value

Significance

Model

5

7.57

37.18

 < 1 × 10–4

Extremely significant

X1

1

19.97

98.05

 < 1 × 10–4

Extremely significant

X2

1

7.97

39.15

0.0004

Significant

X12

1

6.61

32.47

0.0007

Significant

X22

1

3.91

19.21

0.0032

Significant

X1X2

1

0.56

2.76

0.1405

Insignificant

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