Determine the upper and lower control limits

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A retailer has been tracking the number of defective products that it receives from a particular vendor. A sample of size 200 of a particular item (received daily) was taken each day for the last twenty days (see table below).

a. Which type of chart should you use for this data?

b. Determine the upper and lower control limits for the fraction of incorrect plans using two-sigma limits. (Do not round intermediate calculations, and use three decimal places for final answers. Remember the rule about negative LCL's.).

SampleNumber DefectiveSampleNumber Defective1 12 11 16 2 18 12 15 3 10 13 13 4 15 14 16 5 16 15 18 6 19 16 17 7 17 17 18 8 12 18 20 9 11 19 21 10 14 20 22

Reference no: EM132483854

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