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 incontrol?

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SAMPLE 1 2 3 5 67 8 9 10 12 13 2 2 0 2 12 0273 2 1 Number of retests