Question: A manager wishes to build a control chart for a process. A total of five (05) samples are collected with seven (07) observations within each

A manager wishes to build a control chart for a process. A total of five (05) samples are collected with seven (07) 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: O a. 13.67, 19.29 O b. 16.55, 11.47 O c 13.27, 19.69 O d. None is correct O e. 12.60, 20.36

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