Shоw Wоrk: Type yоur solution in the аnswer box аnd be sure to аnswer 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 number of nonconformities. A random sample of 200 units will be inspected each day for nonconformities. 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 # Nonconformities 31 26 51 17 18 24 20 27 22 28 26.4 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.)
Shоw Wоrk: Type yоur solution in the аnswer box аnd be sure to аnswer 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 1 4 3 5 0 2 3 4 9 0 3.1 % Nonconforming 0.5% 2.0% 1.5% 2.5% 0.0% 1.0% 1.5% 2.0% 4.5% 0.0% 1.6% 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.)