NP Control Chart. An alternative to the control chart for
Chapter 15, Problem 138MEE(choose chapter or problem)
NP Control Chart. An alternative to the control chart for fraction defective is a control chart based on the number of defectives or the NP control chart. The chart has centerline at \(n \bar{p}\), the control limits are
\(U C L=n \bar{p}+3 \sqrt{n \bar{p}(1-\bar{p})}\)
\(L C L=n \bar{p}-3 \sqrt{n \bar{p}(1-\bar{p})}\)
and the number of defectives for each sample is plotted on the chart. (a) Verify that the control limits provided are correct. (b) Apply this control, chart to the data in Example 15-4. (c) Will this chart always provide results that are equivalent to the usual P chart?
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