Observations are taken from the output of a company making semiconductors. Table 8-18 shows the sample size and the number of nonconforming semiconductors for each sample. Construct ap-chart by setting up the exact control limits for each sample. Are any samples out of control? If so, assuming special causes, revise the centerline and control limits.
TABLE 8-18

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Items Nonconforming Items Nonconforming Observation Inspected ItemsObservation Inspected Items 80 120 60 150 140 150 160 90 100 160 110 100 14 15 16 17 18 19 20 21 90 160 230 200 150 210 190 160 100 100 90 160 12 10 10 12 24 25 12 13 10 14