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; 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 R- chart are respectively Select one O a. 0,13:32 b. 0,15.25 c. 0,145 @d. None is correct O e. 1, 10.5

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