Question: A quality analyst wants to construct control charts for determining whether a production process is under control. Four samples of three observations each have been

A quality analyst wants to construct control charts for determining whether a production process is under control. Four samples of three observations each have been taken, with actual measurements (in centimeters) shown below. If a three-sigma mean control chart is used, what are the upper control limit and lower control limit?

1	2	3	4
33.2	33.0	33.1	32.1
32.5	33.7	33.8	33.2
33.3	33.9	33.7	33.6

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