Question: X double bar (from question) = 20.02 R-bar (from question) = 0.52 A2 = D3 = D4= These cannot be changed from term to term.

X double bar (from question) = 20.02 R-bar (from

X double bar (from question) = 20.02 R-bar (from question) = 0.52 A2 = D3 = D4= These cannot be changed from term to term. Sample # Observation #1 #2 #3 #4 #5 Mean Range 1 20.32 20.42 20.18 20.13 20.5 2 20.41 20.16 19.98 20.35 20.6 3 19.67 20.51 20.14 20.01 20.0 4 19.91 20.81 19.64 19.84 20.8 5 19.88 19.99 20.1 19.63 19.34 6 19.55 20.55 19.84 19.82 20.02 7 19.85 19.62 19.78 20.17 19.54 8 20 19.9 19.97 19.79 19.69 9 19.99 19.83 19.87 19.5 19.65 10 20.04 19.88 20.09 19.91 20.8 X-Chart Control Limits: UCLX = X-bar + A R UCLx = 1 UCLx = R-Chart Control Limits: UCLR = D4* R-bar UCLR = UCLR = + LCLX = X-bar - A R LCLX LCLx = = LCLR = D3* R-bar LCLR = LCLR = = X-Chart 20.50 20.40 UCLx= - 20.30 20.20 Wait Time (min) 20.10 CLx 20.00 19.90 19.80 19.70 LCLx= 19.60 19.50 1 3 3 4 4 5 6 7 8 9 9 10 N Sample Concern about samples Concern about samples R-Chart 1.00 0.90 0.80 0.70 UCLR= Wait Time (min) 0.60 0.50 0.40 CLR= 0.30 0.20 0.10 0.00 LCLRT 1 2 3 4 5 6 7 8 9 10 Sample Concern about sample The X-chart is The R-chart is Therefore, the process is

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