Homework SourseA process is monitored using mean X and R charts Eight sampl
A process is monitored using mean X and R charts. Eight samples of n=10 observations are gathered and the results are as follows:
Sample
Mean
R
1
4.2
0.43
2
4.4
0.52
3
3.6
0.52
4
3.8
0.20
5
4.9
0.36
6
3.0
0.42
7
4.2
0.35
8
3.2
0.42
A. Compute the center line, the UCL and LCL for the mean x and R charts
B. Is the process in control?
| Sample | Mean | R |
| 1 | 4.2 | 0.43 |
| 2 | 4.4 | 0.52 |
| 3 | 3.6 | 0.52 |
| 4 | 3.8 | 0.20 |
| 5 | 4.9 | 0.36 |
| 6 | 3.0 | 0.42 |
| 7 | 4.2 | 0.35 |
| 8 | 3.2 | 0.42 |
Solution
A> Central Line=3.91250
UCL=4.29435
LCL=3.53065
B> The process is not in control.
