6.9. Table 65.4 presents 20 subgroups of five measure- SS ments on the critical dimension of a part produced by a machining process. a. Set up F and R control charts on this pro- control. cess. Verify that the process is in statistical b. Following the establishment of control charts in part (a) above. 10 new samples in Table 6E.S were collected. Plot the F and R values on the control chart you established in part (a) and draw conclusions. c. Suppose that the assignable cause responsible for the action signals generated in part (b) has been identified and adjustments made to the process to correct its performance. Plot the . Table 6.4 Data for Exercise 6.9 Samp X4 138.1 110.8 138.7 137.4 125.4 130.1 27.9 2 149.3 142.1 105.0 134.0 92.3 124.5 57.0 3 115.9 135.6 124.2 155.0 117.4 129.6 39.1 118.5 116.5 130.2 12 122.6 100.2 117.6 30.0 108.2 123.8 117.1 142.4 150.9 128.5 42.7 102.8 1 112.0 135.0 135.0 145.8 126.1 43.0 120.4 84.3 112.8 1185 119.3 111.0 36.1 132.7 151.1 124.0 123.9 105.1 127.4 46.0 136.4 126.2 154.7 127.1 173.2 143.5 46.9 10 135.0 115.4 149.1 138.3 130.4 133.6 33.7 11 139.6 127.9 151.1 143.7 110.5 134.6 40.6 12 125.3 160.2 130.4 152.4 165.1 146.7 39.8 13 145.7 101.8 149.5 113.3 151.8 132.4 50.0 14 138.6 139.0 131.9 140.2 141.1 138.1 92 15 110.1 114.6 165.1 113.8 139.6 128.7 54.8 16 145.2 101.0 154.6 120.2 117.3 127.6 53.3 17 125.9 135.3 121.5 147.9 105.0 127.1 42.9 18 129.7 97.3 130.5 109.0 150.5 123.4 53.2 19 123 4 150.0 161.6 148.4 154.2 147.5 38.3 20 144 8 138.3 119.6 151.8 142.7 139.4 32.2 Tablo 6E.5 Additional Data for Exercise 6.9, part (b) X4 131.0 184.8 182.2 143.3 212.8 170.8 81.8 174.3 179.7 24.0 2 181.3 193.2 180.7 169,1 4 174.1 480 13 154.8 170.2 168.4 202.7 174.4 4 157.5 5 154.2 160.1 142.2 161.9 157.0 26.9 166.2 155.5 184.3 179.3 60.8 5 216.3 174.3 1 186.0 180.2 149.2 175.2 185.0 175.3 37 8 167.8 143.9 157.5 1718 194.9 167.2 51.0 178.2 186.7 142.4 159.4 167 6 166.9 442 162.6 143.6 132.8 168.9 177.2 157.0 44.5 172.1 191.7 203.4 150 4 196.3 182.8 53.0 and R values from the new subgroups shown in Table 6E.6. which were taken following the adjustment, against the control chart limits estab- lished in part (a). What are your conclusions