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    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).

    $2.19

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