# p-chart: upper and lower control limits

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A medical facility does MRI's 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 2-sigma limits. Is the process in control?

Sample

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

Please show all formulas/steps/calculations.

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##### Solution Summary

The solution calculates the upper and lower control limits for the fraction of retests using 2-sigma limits (see attachment).

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