Introduction
In this chapter, we discuss a very widely used control chart—the control chart for monitoring the mean and variation of a variable that is to be controlled. This chart is used to study the variations that occur in the mean or central tendency and dispersion in a process data. The control chart for monitoring the mean is referred to as the x̄ (x-bar) chart and is used to monitor the variation in the process mean by plotting the average value of samples of certain size. Another chart that is used to monitor and study the variation in the process is known as the R chart or the control chart for range. In practice, both the x̄ and R chart are used in conjunction and are the most widely used charts ...
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