Question: Range Chart 140 120 100 80 Sample Range 60 40 20 0 1 2 3 4 5 6 7 8 9 10 11 12 Sample

Range Chart 140 120 100 80 Sample Range 60 40 20

Range Chart 140 120 100 80 Sample Range 60 40 20 0 1 2 3 4 5 6 7 8 9 10 11 12 Sample Number Suppose you constructed control charts for the time spent by customers in a retail checkout lane, computing UCL, CL, and LCL based upon a large number of historical observations. Using those control limits, you decide to plot the most recent 12 data points as shown below. Given the following range chart, which general conclusion is most appropriate? (Rchart.png ) Range Chart 140 120 100 80 Sample Range 60 40 20 0 1 2. 3 4 5 6 7 8 9 10 11 12. Sample Number The process is capable O The process is not capable O The process is in control O The process is out of control

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