STATISTICAL PROCESS CONTROL / INTERACTIVE LAB
Process Stability Lab.
Distinguish common-cause variation, special-cause signals, control limits and capability.
STATISTICAL PROCESS CONTROL
I-MR style demonstratorProcess Stability Lab
MEAN50.03
σ̂1.31
UCL53.95
LCL46.08
Cp1.52
Cpk1.52
Control limits are estimated from the first 16 baseline observations and then held fixed, so an injected step shift cannot redefine its own limits and hide the signal. Specification limits remain independent customer requirements. The displayed overall mean and Cpk reflect all 30 observations; interpret capability only after stability is established.