B F G K 1 A D E H L M Parts manufactured by an injection molding process are subjected to a compressive strength test. Twenty Table Values to Construct the Control Charts for n=5 2 samples of five parts each are collected, and the compressive strengths (in psi) are shown in the table A2 D3 D4 3 below. Establish X-bar and R control charts for compressive strength using these data. Is the process in 0.577 2.115 statistical control? 0 4 5 6 Sample No x1 x2 X3 x4 X5 7 1 83 81.2 78.7 75.7 77 8 2 78.3 78.8 71 84.2 88.6 85.7 Centreline Exdoublebars = mean of xbar UCLx = CL + A2*Rbar LCLX = CL - A2*Rbar Centre line = Rbar= mean of R UCLr = D4* Rbar LCLr =D3*Rbar 9 3 75.8 84.3 81 75.7 10 4 74.4 82.5 11 5 78.9 78.4 79.9 6 81.8 12 13 14 7 78 80.8 83.4 75.3 74.5 79.2 80.5 75.7 80 82.6 87.3 80.8 81.5 76.2 75.2 74.1 78.2 89.7 73.4 86 64.1 82.1 73.8 73.8 82 9 84.4 86.2 75.2 81.5 15 16 79.7 74.5 80.2 74.3 78.1 10 17 11 71.1 78.4 79.3 79.1 18 12 80.6 81.8 81.7 79.5 19 13 82.7 81.3 20 14 78.6 79.2 85.5 75.3 71.7 21 15 82.8 22 16 78.8 80.8 74.9 82.1 79.6 78.2 76.9 77.8 17 82.1 84.5 23 24 25 26 27 18 77.7 73.4 79.1 78.2 81.2 84.4 78.7 80.2 75.5 83.5 81.2 78.6 82.1 79.2 81.6 19 79 20 84.5 73.1 80.6