Hint: Use this chart to determine the Upper Control Limit (UCL) and Lower Control Limit (LCL) for a P chart. P chart is used when you have Defectives data with a Variable Sample Size

Average Defective Proportion (p-bar)

Calculate and enter the average defective portion across all samples. Enter a value between zero and one

Number of observations (in ith sample)

Enter the number of observations in the ith sample

Upper Control Limit (UCL)

Number

Lower Control Limit (LCL)

Lower Control Limit (LCL)

Control Limits

Control Limits cannot be calculated since either a negative or greater than one average defective proportion (p-bar) was entered. Enter a value between zero and one