Ten samples of size four were taken from a process, and their weights measured. The sample averagesand sample ranges are in the following table. Construct and plot an x-bar and R-chart using this data. Is the process in control?Sample Mean Range 1 20.01 0.45 2 19.98 0.67 3 20.25 0.30 4 19.90 0.30 5 20.35 0.36 6 19.23 0.49 7 20.01 0.53 8 19.98 0.40 9 20.56 0.95 10 19.97 0.79Sample12345678910Mean20.0119.9820.2519.920.3519.2320.0119.9820.5619.97Range0.450.670.30.30.360.490.530.40.950.79
