Problem Your Organization Manufactures Cylinder Liners For The Marine And Truck Engine Markets You Wish To Understand 1 (13.75 KiB) Viewed 31 times
Problem: Your organization manufactures cylinder liners for the marine and truck engine markets. You wish to understand the levels of process control for the critical characteristics of the liners. One such characteristic is bore diameter. You have a tolerance for this dimension of 33.0mm ± 0.80mm. You have measured 20 subgroups of 5 (each subgroup consisting of consecutively produced parts) in order to create a pair of Shewhart Statistical Process Control charts. The table below shows the averages and ranges for the subgroups. (Round your answers to three decimal places.) Subgroup Average Range Subgroup Average: Range 33.2 1.6 11 33.2 1.3 32.5 1.3 12 33.7 1.1 3 33.8 1.2 13 33.0 1.7 4 33.8 1.3 14 34.1 1.2 5 33.1 1.5 15 33,2 1.3 6 32.8 1.1 16 32.9 1.8 33.3 1.4 17 33.2 4 8 34.0 1.5 18 33.5 1.5 34.7 1.2 19 33.0 1.0 9 10 33.4 1.2 20 32.8 13
a) Draw and appropriately annotate a pair of control charts for the data. Ensure that all equations used are shown and explained. b) Based on the control charts you drew for (a), decide whether the process is in control. c) If necessary, calculate the revised control limits for both charts and draw the charts with revised values. Is the process under control now?
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