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P-Chart

P-Chart - You can use either the p chart or the np chart to plot your defective units. If the ratio is less than the lower confidence limit, then using a traditional p chart with the data may result in control limits that are too wide. Plotted points each plotted point represents the proportion of defectives for one subgroup, pi: Find definitions and interpretation guidance for every statistic and graph that is provided with the p chart. The center line is the average proportion of defectives. Stat > control charts > attributes charts > p complete the following steps to specify the data to analyze for your control chart. Open the sample data, defectiverecords.mwx. The supervisor for a call center wants to evaluate the process for answering customer phone calls. Use this control chart to monitor process stability. Data points on a p chart follow the binomial distribution.

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