Practice Problem 6.3 4 process is found to have a defective rate of 2%. What are the upper and lower control chart limits if you wish to use a sample ste of 100 and consider within 3 sigma Imits? (This data yields itself to a proportion of defects chart). Formula 68.9 page 231. Step 1) Compute P-Bar total number of errors P= Total number records respected Step 2) Next compute the Standard Deviation of defects follows: P(1-P) 1 Step 3) Compute the UCL and LCL of p at 13 sigma limits: UCL - B+30, LCL - P-0, Consider problem 6.3 (practice problem). In this problem the percentage of defects is 2%, thus we are able to calculate the standard error of P-bar. Given this, if on the 21 day we encountered 7 errors. Such a finding would be cause for investigation, since the upper Control limit is 6.2 errors per 100. True False