Question: Amanager wishes to build a control chart for a process. A total of five (05) samples are collected with four (04) observations within each sample.
Amanager wishes to build a control chart for a process. A total of five (05) samples are collected with four (04) observations within each sample. The sample means (X - bar) are; 14.09.13.94, 16.86,18.77, and 16.64 respectively. Also, the corresponding ranges are; 9.90, 7.73,2.89.7.56, and 3.49 respectively. The lower and upper control limits of the x - bar chart respectively are
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