II'll upvote for a complete answer!

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? Range Chart Sample Range 140 120 100 BO 60 40 20 0 1 2 3 9 10 11 12 5 7 8 Sample Number The process is capable The process is not capable The process is in control The process is out of control Using the chart from the previous question, what is a more usable conclusion? O Houston, we have a problem Variability in checkout times has recently been lower than usual Average checkout times have recently been faster than usual The process is getting worse Average checkout times have recently been slower than usual O Variability in checkout times has recently been larger than usual