Sample number |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
Total |
Mean |
11.2 |
11.8 |
10.8 |
11.6 |
11.0 |
9.6 |
10.4 |
9.6 |
10.6 |
10.0 |
106.6 |
Range |
7 |
4 |
8 |
5 |
7 |
4 |
8 |
4 |
7 |
9 |
63 |
From the above control limits values we observe that all the sample means lie between the UCL and LCL (i.e.) 7.006 < \(\overline {X}\)i < 14.31 for i = 1, 2, 3,…….. 10. Also, all the sample range value lie between the control limits for R (i.e) 0 < R < 13.32, i = 1, 2, 3,…., 10. Hence we conclude that the process is in control.