Question: Why are the Control Limits varying and not displayed as straight, continuous lines across the P Chart shown here? 0.5- UCLE 0.4 Proportion D-0. 0.3

Why are the Control Limits varying and not displayed as straight, continuous lines across the P Chart shown here? 0.5- UCLE 0.4 Proportion D-0. 0.3 0.2 LCL 0.1- 1 3 5 7 9 11 13 15 17 Day A. The software randomizes the Control Limits B. The chart is in error because the Control Limits are supposed to be fixed at +/- 3 sigma C. The varying Control Limits indicate that an NP Chart should have been used instead D. As the subgroup size changes the Control Limits also change
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