Question: In process industry during a daily production run, a total of five (05) samples are collected with four (04) observations within each sample. The sample

In process industry during a daily production
In process industry during a daily production run, 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. 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 a. 11.47, 16.55 O b. 18.55, 13.47 O C. None is correct O d. 11.44, 20.66 O e. 11.34, 21.18

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