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Phoniex University
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After becoming familiar with their jobs, the sorting machine operators of Example 6.3 now average only two address errors per 100 parcels sorted. Prepare a p -chart for experienced sorting operators.
Example 6.3
Control Chart for Attributes ( p -chart)
In some cases, system performance is classified as either “good” or “bad.” Of primary concern is the percentage of bad performance. For example, consider the operator of a mechanized sorting machine in a post office. The operator must read the ZIP code on a parcel and, knowing its location in the city, divert the package by conveyor to the proper route truck. From past records, the error rate for skilled operators is about 5 percent, or a fraction defective of 0.05. Management wants to develop a control chart to monitor new operators to ensure that personnel who are unsuited for the job can be identified. Equations (5) and (6) below are used to construct a percentage or p-chart. These formulas should be familiar because they represent the 3 standard deviation confidence interval for a percentage.
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