Observations are taken from the output of a company making semiconductors.

Table 8-26 shows the sample size and the number of nonconforming semiconductors for each sample. Construct a p-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.

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TABLE 8-26 Items Nonconforming Items Observation Inspected Items Observation Inspected Nonconforming Items 1234567890122 80 120 60 150 140 150 10 160 90 100 160 12 110 100 200 364580765285 156789282222 14 90 4 160 5 230 3 200 12 150 8 210 20 190 160 100 23 100 12 24 90 25 160 10 6498279 14