Solve the below:
Q: Ten samples of size four were taken from a process, and their weights measured. The sample averages and sample ranges are in the following table. Construct and plot an x-bar and R-chart using this data. Is the process in control?
Sample Mean Range 1 20.01 0.45 2 19.98 0.67 3 20.25 0.30 4 19.90 0.30 5 20.35 0.36 6 19.23 0.49 7 20.01 0.53 8 19.98 0.40 9 20.56 0.95 10 19.97 0.79
| Sample |
Mean |
Range |
| 1 |
20.01 |
0.45 |
| 2 |
19.98 |
0.67 |
| 3 |
20.25 |
0.3 |
| 4 |
19.9 |
0.3 |
| 5 |
20.35 |
0.36 |
| 6 |
19.23 |
0.49 |
| 7 |
20.01 |
0.53 |
| 8 |
19.98 |
0.4 |
| 9 |
20.56 |
0.95 |
| 10 |
19.97 |
0.79 |
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