As a quality control engineer, you have taken the task to sample 6 planks of wood every day for the next 20 days. You need to check the length consistency of the wood planks produced to identify any abnormal process variations. Table 2 below shows the data collected. Table 2: Length of wood planks (mm) Day 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 105.6 95.6 94.4 102.5 100.5 101.2 94.2 98.5 101.5 92.2 96.5 100.2 115.3 91.5 102.3 99.2 88.6 95.5 92.3 102.5 93.8 98.6 93.2 100.2 105.6 96.5 99.3 102.3 102.5 96.8 91.6 108.3 108.6 100.5 99.9 91.2 94.3 94.4 90.8 107.5 Wood plank lengths 98.8 102.5 102.9 105.4 95.1 98.8 98.6 99.3 101.7 103.8 95.3 99.6 96.4 99.7 104.8 101.2 99.8 107.6 99.8 91.2 95.5 96.6 102.5 92.3 106.3 109.6 96.3 99.7 98.7 92.5 92.5 89.6 87.4 99.5 92.5 99.6 95.6 91.4 109.3 92.5 100.5 106.8 101.5 99.9 106.1 91.1 102.5 107.9 108.9 90.3 105.6 94.6 110.5 98.3 103.5 97.0 92.2 91.3 92.5 96.3 95.6 109.1 93.3 96.4 102.2 92.5 103.7 103.5 101.6 97.6 95.7 107.5 111.5 99.4 100.2 95.4 90.6 100.5 95.6 91.6 8100 (a) Analyze data in Table 1 above using the appropriate control charts. (b) Comment on the control charts that you have obtained in (a)