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Question
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 these 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 |
Answer
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