Formulas and Tables
SPC DEMO
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Chi-square formula and degrees of freedom table
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Alpha value = 5% |
Alpha value = 1%
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Degrees of freedom
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Value
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Degrees of freedom
|
Value
|
|
|
1
|
3.84
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1
|
6.63
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|
|
2
|
5.99
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2
|
9.21
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|
|
3
|
7.82
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3
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11.3
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|
|
4
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9.49
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4
|
13.3
|
|
|
5
|
11.10
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5
|
15.1
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|
|
6
|
12.60
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6
|
16.8
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|
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7
|
14.10
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7
|
18.5
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|
|
8
|
15.50
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8
|
20.1
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|
|
9
|
16.90
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9
|
23.2
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|
|
10
|
18.30
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10
|
24.7
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|
|
11
|
19.70
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11
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26.2
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|
|
12
|
21.00
|
12
|
27.7
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|
|
13
|
22.40
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13
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29.1
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|
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14
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23.70
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14
|
30.6
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|
|
15
|
25.00
|
15
|
30.6
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|
|
16
|
26.30
|
16
|
32.0
|
|
|
17
|
27.60
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17
|
33.4
|
|
|
18
|
28.90
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18
|
34.8
|
|
|
19
|
30.10
|
19
|
36.2
|
|
|
20
|
31.40
|
20
|
37.6
|
|
|
21
|
32.70
|
21
|
38.9
|
|
|
22
|
33.90
|
22
|
40.3
|
|
|
23
|
35.20
|
23
|
41.6
|
|
|
24
|
36.40
|
24
|
43.0
|
|
|
25
|
37.70
|
25
|
44.3
|
|
|
26
|
38.90
|
26
|
45.6
|
|
|
27
|
40.10
|
27
|
47.0
|
|
|
28
|
41.30
|
28
|
48.3
|
|
|
29
|
42.60
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29
|
49.6
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|
|
30
|
43.80
|
30
|
50.9
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