2- Given the following set of data for X bar and R shown in the lower table, plot their values on control charts with the centerlines and control limit shown in the upper table. X chart R chart LCL 9.74 0 CL 10.66 1.59 UCL 11.58 3.35 Sample X Range Sample X Range 10.44 1.8 11 10.56 1.5 10.46 1.4 12 9.96 2.4 9.98 0.7 13 10.44 2.8 9.82 2.6 14 10.96 1.0 10.90 2.4 15 11.14 1.5 10.36 1.1 16 10.04 0.8 11.32 0.8 17 11.44 2.1 10.86 1.2 18 11.84 1.0 10.58 0.5 19 11.14 2.7 9.52 1.9 20 11.44 1.6 (a) Do the charts show good statistical control? Why or why not? (b) What was the sample/subgroup size used