The Time In Minutes To Replace Vehicle Wiper Blades At A Service Center Was Monitored Using A Mean And A Range Chart Si 1 (38.02 KiB) Viewed 11 times
The Time In Minutes To Replace Vehicle Wiper Blades At A Service Center Was Monitored Using A Mean And A Range Chart Si 2 (46.09 KiB) Viewed 11 times
The time in minutes to replace vehicle wiper blades at a service center was monitored using a mean and a range chart. Six samples of n=20 observations were obtained and the sample means and ranges were computed: Sample 1 2 3 2 3 Number of observations in Subgroup, 5 6 3.06 3.15 3.11 7 Mean 8 9 10 11 12 13 14 15 16 17 18 19 20 Range .42 1.50 Click here for the Excel Data File Factors for three-sigma control limits for and Rcharts Factor for Chart, 42 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 Sample 4 5 0.19 0.19 0.18 6 Limit, 03 0 0 FACTORS FOR R CHARTS Lower Control 0 0 0:00 0.14 0.18 0.22 0.26 0.20 Mean 0.31 0.35 0.35 0.36 3.13 3.06 3.09 0.38 0.39 0.40 0.41 Range 46 46 45 Upper Control Linit, 04 3,27 2.57 2.26 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 a. Using the factors in the above table, determine upper and lower limits for mean and range charts. (Do not round intermediate calculations. Round your mean value to 3 decimal places and range value to 4 decimal places.)
Using the factors in the above table, determine upper and lower limits for mean and range charts. (Do not round intermediate calculations. Round your mean value to 3 decimal places and range value to 4 decimal places.) Upper limit for mean Lower limit for mean Upper limit for range Lower limit for range a1. Is the process in control? O The process is in control. O The process is not in control. b. 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.) D Sample Mean 1 2 3 4 7.10 6.92 7.25 7.54 Upper limit for mean Lower limit for mean Upper limit for range Range 52 50 51 Sample Mean 5 7.21 8.01 6 7 8 7,80 7.63 Range 46 .55 -53 .49
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