| 4. 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 |
cybacatx
q4_revised.xlsx
