Action and Warning Lines for Shewart Chart for Ranges
Group Size | Action Lines | Warning Lines | ||
|
|
|
|
|
2 | 0.00 | 4.12 | 0.04 | 2.81 |
3 | 0.04 | 2.99 | 0.18 | 2.18 |
4 | 0.10 | 2.58 | 0.29 | 1.94 |
5 | 0.16 | 2.36 | 0.37 | 1.80 |
6 | 0.21 | 2.22 | 0.42 | 1.72 |
7 | 0.26 | 2.12 | 0.46 | 1.66 |
8 | 0.29 | 2.05 | 0.50 | 1.62 |
9 | 0.33 | 1.99 | 0.52 | 1.58 |
10 | 0.35 | 1.94 | 0.54 | 1.55 |
The action and warning lines are obtained by multiplying the values in the table by the mean range of the values obtained from the process.
