The following summary of data is for subgroups of n = 3 for a 10-day period:
Day | Mean | Range |
1 | 48.03 | 0.29 |
2 | 48.08 | 0.43 |
3 | 47.90 | 0.16 |
4 | 48.03 | 0.13 |
5 | 47.81 | 0.32 |
6 | 48.07 | 0.22 |
7 | 47.99 | 0.16 |
8 | 48.04 | 0.15 |
9 | 47.99 | 0.46 |
10 | 48.04 | 0.15 |
a. Compute control limits for the range.
b. Is there evidence of special cause variation in (a)?
c. Compute control limits for the mean.
d. Is there evidence of special cause variation in (c)?
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