The values for samples ranging in size from 0 to 25 for XBar and R charts are:
|
Chart for Averages |
Chart for Ranges |
||
|
Sample Size |
A2 |
D3 |
D4 |
|
0 |
0.000 |
0.000 |
0.000 |
|
1 |
2.660 |
0.000 |
3.267 |
|
2 |
1.881 |
0.000 |
3.268 |
|
3 |
1.023 |
0.000 |
2.574 |
|
4 |
0.729 |
0.000 |
2.282 |
|
5 |
0.577 |
0.000 |
2.114 |
|
6 |
0.483 |
0.000 |
2.004 |
|
7 |
0.419 |
0.076 |
1.924 |
|
8 |
0.373 |
0.136 |
1.864 |
|
9 |
0.337 |
0.184 |
1.816 |
|
10 |
0.308 |
0.223 |
1.777 |
|
11 |
0.285 |
0.259 |
1.755 |
|
12 |
0.266 |
0.284 |
1.717 |
|
13 |
0.249 |
0.308 |
1.692 |
|
14 |
0.235 |
0.329 |
1.671 |
|
15 |
0.223 |
0.348 |
1.652 |
|
16 |
0.212 |
0.363 |
1.637 |
|
17 |
0.203 |
0.378 |
1.622 |
|
18 |
0.194 |
0.391 |
1.608 |
|
19 |
0.187 |
0.403 |
1.597 |
|
20 |
0.180 |
0.415 |
1.585 |
|
21 |
0.173 |
0.425 |
1.575 |
|
22 |
0.167 |
0.434 |
1.566 |
|
23 |
0.162 |
0.443 |
1.557 |
|
24 |
0.157 |
0.451 |
1.548 |
|
25 |
0.153 |
0.459 |
1.541 |
|
|
XBar-R, XBar-S, R, S and X chart calculations. |
