Quality control is a process by which a business ensures that product quality is maintained or improved. Learn whether quality control is a career option for you.

Control chart- a time-ordered plot of sample statistics, used to distinguish between random and nonrandom variability Control limits- the dividing lines between random and nonrandom deviations from ...

This paper establishes a criterion that measures approximately the average net income of a process under surveillance of an X̄ chart when the process is subject to random shifts in the process mean.