Page 415 - The Handbook for Quality Management a Complete Guide to Operational Excellence

402 A p p e n d i x A

Chart for Ranges
Observations Factors for Central Line Factors for Control Limits
in Sample, n d 2 1/d 2 d 3 D 1 D 2 D 3 D 4
2 1.128 0.8865 0.853 0 3.686 0 3.267
3 1.693 0.5907 0.888 0 4.358 0 2.574
4 2.059 0.4857 0.880 0 4.698 0 2.282
5 2.326 0.4299 0.864 0 4.918 0 2.114
6 2.534 0.3946 0.848 0 5.078 0 2.004
7 2.704 0.3698 0.833 0.204 5.204 0.076 1.924
8 2.847 0.3512 0.820 0.388 5.306 0.136 1.864
9 2.970 0.3367 0.808 0.547 5.393 0.184 1.816
10 3.078 0.3249 0.797 0.687 5.469 0.223 1.777
11 3.173 0.3152 0.787 0.811 5.535 0.256 1.744
12 3.258 0.3069 0.778 0.922 5.594 0.283 1.717
13 3.336 0.2998 0.770 1.025 5.647 0.307 1.693
14 3.407 0.2935 0.763 1.118 5.696 0.328 1.672
15 3.472 0.2880 0.756 1.203 5.741 0.347 1.653
16 3.532 0.2831 0.750 1.282 5.782 0.363 1.637
17 3.588 0.2787 0.744 1.356 5.820 0.378 1.622
18 3.640 0.2747 0.739 1.424 5.856 0.391 1.608
19 3.689 0.2711 0.734 1.487 5.891 0.403 1.597
20 3.735 0.2677 0.729 1.549 5.921 0.415 1.585
21 3.778 0.2647 0.724 1.605 5.951 0.425 1.575
22 3.819 0.2618 0.720 1.659 5.979 0.434 1.566
23 3.858 0.2592 0.716 1.710 6.006 0.443 1.557
24 3.895 0.2567 0.712 1.759 6.031 0.451 1.548
25 3.931 0.2544 0.708 1.806 6.056 0.459 1.541

21_Pyzdek_AppA_Ch21_p399-402.indd 402 11/9/12 5:32 PM