7.22. In designing a fraction nonconforming chart with TE center line at p = 0.20 and three-sigma control limits, 9W20 what is the sample size required to yield a positiveW lower control limit? What is the value of n necessary pean lower co to give a probability of 0.50 of detecting a shift in the process to 0.26? Mmo 916 2m9 amst