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, 1877, and 16.64 respectively. Also, the corresponding ranges are: 9.90, 7.73, 2.89.7.56, and 3.49 respectively. The lower and upper control limits of the R-chart are respectively a. 0. 1232 b.0 13,32 0 14.40 d. 10.5 e. None is correct

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