Statistical process control
Industrial
processes tend to have normally distributed variability, in part as a consequence of the central limit theorem applying
to the sum of many small
influential factors. Random samples taken over time can thus be used to easily verify that a given process is
not getting out of “control.”
What is statistical control?
A variable that continues to be described by the same
distribution when observed over
time is said to be in
statistical control, or simply in control.
