Q4) 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
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Q4) 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 |
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