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

A manager wishes to build a control chart for a process. A total of five (OS) samples are collected with eight (os) observations within each sample. The sample means (X-bar) are 15.36,1461,16.36,20 28, and 1577 respectively. Also, the corresponding ranges are; 10.79, 8.37, 281,8.17, and 3.31 respectively. The lower and upper control limits of the x-bar chart are respectively Select one O a. 13.67, 19.29 b. 13.27. 19.69 OC 12.60, 20.36 d. 14.00, 18.95 e None is correct

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