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Control Limits for NP Chart

Use this chart to determine the Upper Control Limit(UCL) and Lower Contrl Limit(LCL) for a NP chart.NP chart is used when you have Defects data with a fixed Sample size
  • Calculate the average defective portion across all samples
  • Enter the number of observations in each sample.Since it is fixed sample size,the number of observations will be same in all samples