Your question is Statistical Process Control in Manufacturing. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You are reviewing a manufacturing line and see repeated shifts in defect rate and cycle time across shifts. The team wants a statistical way to tell normal variation from a real process change.
How have you used statistical process control in a manufacturing environment?