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; 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 5.0 respectively. The lower and upper control limits of the x-bar chart are respectively Select one: O a. 11.47, 16.55 O b. 11.29, 20.65 O c. 11.23, 20.89 O d. None is correct O e. 11.44, 20.66

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