Show Work: Type your solution in the answer box and be sure…
Show Work: Type your solution in the answer box and be sure to answer all parts of the question. A project team successfully increased the yield of a manufacturing process. As part of the Control Plan, a statistical process control chart will be used to monitor the percentage of nonconforming units. A random sample of 200 units will be inspected each day for nonconforming units. Data for the last 10 days is given below. Day 1 2 3 4 5 6 7 8 9 10 Average # Units 200 200 200 200 200 200 200 200 200 200 200 # Nonconforming Units 4 0 2 3 4 3 5 3 9 3 3.6 % Nonconforming 2.0% 0.0% 1.0% 1.5% 2.0% 1.5% 2.5% 1.5% 4.5% 1.5% 1.8% As the team’s SPC expert, which control chart would you recommend? Calculate the upper control limit for your recommended chart. Calculate the lower control limit for your recommended chart. Is the process in control? Explain your answer. (Hint: You can answer this question without drawing a control chart.)
Read Details