A quality inspector took four samples, each with five observations, of the length of time for glue to dry. The analyst computed the mean of each sample and then computed the grand mean. The mean and grand mean are measured in minutes. Use this information to construct 3-sigma control limits for an x-bar and an R chart. Use the table to match the correct A2, D3, and D4 values to construct the charts. Number of Observations in Each Sample (n) 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Factor for X-bar Chart (A2) 1.88 1.02 0.73 0.58 0.48 0.42 0.37 0.34 0.31 0.29 0.27 0.25 0.24 0.22 0.21 0.20 0.19 0.19 0.18 Lower Control Limit for R- Chart (D3) 0 0 0 0 0 0.08 0.14 0.18 0.22 0.26 0.28 0.31 0.33 0.35 0.36 0.38 0.39 0.40 0.41 Upper Control Limit for R- Chart (D4) 3.27 2.57 2.28 2.11 2.00 1.92 1.86 1.82 1.78 1.74 1.72 1.69 1.67 1.65 1.64 1.62 1.61 1.60 1.59 1. O D3 = = > 2. 0.73 D4 = = 3. 2.28 A2 = 4. 0.58