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25 November, 12:24

Peter Ittig's department store, Ittig Brothers, is Amherst's largest independent clothier. The store receives an average of 8 returns per day.

Using z = 3, the control chart limits are:

what are UCL and LCL?

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  1. 25 November, 13:06
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    C-chart is the best suited for this since it is widely used to determine if the defects or returns are within the control limits or not.

    Mean = average = 8 per day

    Z=3

    UcL = mean + 3[square root of mean] = 8 + 3 (Sq root of 8) = 16.48

    LcL = mean - 3[ square foot of mean] = - 0.485

    So the returns are within the control limits.
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