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.

Types of Control Charts There are two main types of control charts that utilize the mean and standard deviation as some of the quality determinant parameters.

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.