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

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, 14.94,16.86, 18.77, and 16.64 respectively. Also, the corresponding ranges are; 9.90, 7.73, 4.51, 7.56, and 4.00 respectively. The lower and upper control limits of the x-bar chart are respectively Select one: O a. 11.34, 21.18 O b. 11.44, 20.66 O c. 11.47, 16.55 O d. 18.55, 13.47 O e. None is correct

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