Question: In Quality Engineering (Vol. 28, No. 3, 2016), control charts were used to monitor the weight of frozen scallops packed at a marine products plant.

In Quality Engineering (Vol. 28, No. 3, 2016), control charts were used to monitor the weight of frozen scallops packed at a marine products plant. During packing, the scallops are placed in plastic trays. The target total weight (scallops and plastic trays) is 2 kilograms. To monitor the packing process, the quality control department takes 5 samples of 5 plastic trays in the overnight shift every day and records the weight of each tray. An R-chart of weight for the first 40 samples is shown.

$Range of Weight UCL-01 W \W$

a. Identify the rational subgroups used to construct the R-chart.
b. Is the process in control? If not, what do you recommend?

Range of Weight UCL-01 W \W

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