A medical facility does MRIs for sports injuries. Occasionally a test yields inconclusive results and must be repeated. Using the following sample data and n=200, determine the upper and lower control limits for the fraction of retests using two –sigma limits. Is the process in control? (z = 2) 1 2 3 4 5 6 7 8 9 10 11 12 13 # 1 2 2 0 2 1 2 0 2 7 3 2 1 # = Number of retests Given the following data for the number of defects per spool of cable, using three-sigma limits, is the process in control? (z = 3) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 # 2 3 1 0 1 3 2 0 2 1 3 1 2 0 # = Number of defects
A medical facility does MRIs for sports injuries. Occasionally a test yields inconclusive results and must be repeated. Using the following sample data and n=200, determine the upper and lower control limits for the fraction of retests using two –sigma limits. Is the process in control? (z = 2) 1 2 3 4 5 6 7 8 9 10 11 12 13 # 1 2 2 0 2 1 2 0 2 7 3 2 1 # = Number of retests Given the following data for the number of defects per spool of cable, using three-sigma limits, is the process in control? (z = 3) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 # 2 3 1 0 1 3 2 0 2 1 3 1 2 0 # = Number of defects
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