Process Control with Variable Measurements Using X bar and R Charts Mean X bar Chart...

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Process Control with Variable Measurements Using X bar and R Charts Mean X bar Chart Upper control limit UCL A R Lower control limit LCL A R Range Chart Upper control limit UCLR DAR Lower control limit LCLR D R 1 Great Outdoors tracked parcel delivery time in days for four randomly selected orders during one week period Observations X2 Sample No Dayl Day2 Day3 Day4 Day5 Day6 Delivery Time X1 6543210 2 5 4 6 2 5 3 3 3 1 4 1 0 1 2 3 X bar mean chart 4 5 6 A2 D3 D4 factors are shown in Chapter 10 slides X3 Days 3 6 3 5 1 3 X4 3 7 8 9 10 11 2 2 Find 30 three sigma X bar and Range chart control limits Is process in control 3 4 3 X BAR Sample R range Mean Average Delivery time range Sample Range 2745AENTO Average Range Chart 0 1 2 3 4 5 6 7 8 9 10 11 Days

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