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    Find the UCL and LCL

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    Four samples of 100 each were taken from an assembly line, with the following results:
    Using the historical average as the central line of the chart, which one of the following is the limits for an attributes control chart with z = 2?

    Sample Number Number Defective

    1 6
    2 12
    3 2
    4 8

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    Solution Summary

    This solution determines which sample has limits for an attributes control chart with z=2.