Chapter 10 Security Camera Problem - Answer Sheet X double bar R bar UCL x bar Show calculation: LCL x bar Show calculation: UCLR Show calculation: LCL R Show calculation: Construct a 3 sigma mean chart: Construct a 3 sigma range chart: The time in minutes needed to assemble security cameras at a production facility was recorded for eight samples of 15 observations each, and means and ranges were computed. Using factors from the above table, compute control limits for the means and ranges. (Round your answers to 3 decimal places.) Sample Range Sample Mean Range 721 6 55 7 53 .51 7.63 49 46 1 2 3 4 Mean 7.10 6.92 7.25 7.54 .52 48 .50 8.01 7.80 8 Factors for three-sigma control limits for 7 and Rcharts OOOOO Number of Observations in Subgroup. n 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Factor for i 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 FACTORS FOR R CHARTS Lower Upper Control Limit Control Limit D3 D4 327 2.57 2 28 2.11 2.00 0.08 1.92 0.14 1.86 0.18 1.82 0.22 1.78 0.26 1.74 0.28 1.72 0.31 1.69 0.33 1.67 0.35 1.65 0.36 1.64 0.38 1.62 1.61 0.40 1.60 0.41 1.59 0.39