The defect rate for a product has historically been about 1.6%. What type of control chart is used t
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.
a) Construct and plot appropriate control charts for this data.
b) Is the process in control? Explain why or why not.
| 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 |
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