Please provide an explanation with a detailed example on how to calculate LCL.
Formula:
p chart formula
Individual Moving Range chart formula
X bar R chart formula
n |
d2 |
c4 |
2 |
1.128 |
0.7979 |
3 |
1.693 |
0.8862 |
4 |
2.059 |
0.9213 |
5 |
2.326 |
0.9400 |
6 |
2.534 |
0.9515 |
7 |
2.704 |
0.9594 |
8 |
2.847 |
0.9650 |
9 |
2.970 |
0.9693 |
10 |
3.078 |
0.9727 |
11 |
3.173 |
0.9754 |
12 |
3.258 |
0.9776 |
13 |
3.336 |
0.9794 |
14 |
3.407 |
0.9810 |
15 |
3.472 |
0.9823 |
16 |
3.532 |
0.9835 |
17 |
3.588 |
0.9845 |
18 |
3.640 |
0.9854 |
19 |
3.689 |
0.9862 |
20 |
3.735 |
0.9869 |
For the data in Table 1, the average range and σ are given by:
Using the estimate of the standard deviation from the average range, we can now calculate the control limits:
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