Question: Given the following process control data for a normally distributed quality variable (three samples of size four each): Machine Measurements #1 15 14 15 12
Given the following process control data for a normally distributed quality variable (three samples of size four each):
| Machine | Measurements | |||
| #1 | 15 | 14 | 15 | 12 |
| #2 | 18 | 16 | 20 | 16 |
| #3 | 16 | 17 | 16 | 17 |
If the process is known to have a mean of 15 and a standard deviation of 3, what are the three sigma upper and lower control limits for an x-bar chart?
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