4.} A quality control engineer collected a set of 15 samples of size n = 5. The data are shown in the following table. Based on these data, determine control limits for the X and 3 control charts. Plot the data on the control charts, and examine whether the process is in statistical control. Sample I x, l; x; I. it. 1 1051 9.30 9.13- 9.?2 1027 2 10113 9.?9 9.2? 9.84 9.43 3 9.91 10.52 9.41 9.?5 1023 4 10.14 10.20 9.66 9.?2 10.5'1II .5 9.68 10.35 9.11 9.91 1.0.11? 6 10.5? 11.36 9.65 9.4-3 10.11 1' 103? 9.93 9. 1'." 9.88 9.47 3 9.81 10.110 9.62 9.11% 8.99 9 1030 10.05 3.16 10.24 10.19 10 9.38 9.61 10.3? 9.45 8.46 11 10.111 10.05 1036 3.62 9.3:] 11 10.29 9.32 9.05 9+\" 10.56 13 10.51 10.38 3.119 9.17 9.85 14 9.21 9 60 9.50 11.118 10.12 15 10% 9.3? 9.114 10.38 9.30