Question: A manager wishes to build a control chart for a process. A total of five (05) samples are collected with four (04) observations within each

A manager 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; 15.36,14.61,16,36,20.28, and 15.77 respectively. Also, the corresponding ranges are 10.79, 8.37, 2.81,8.17, and 3.31 respectively. The lower and upper control limits of the x-bar chart are respectively Select one a. None is correct b. 12.40, 19.72 o o o o c. 18.55, 13.47 d. 11.59, 21.36 e. 16.55, 11:47

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