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what is the X bar chart?
X bar chart is one type of control chart that is used for the monitor of the arithmetic means of the constant size n of the successive sample. This type of control chart is used for the things that can be measured continuously, like weight, temperature, thickness, etc.
Like in this method, we can take the example of temperature in which the temperature of every day is different for the very week. The difference of each week is a plot on the chart and makes the analyses of these continuous units of the temperatures. And in the chart, we put the seven values of each day.
In this, if we calculate the control limit for each week then the sample mean is assumed to be a normal distribution, and the assumptions are justified by the theorem that is known as a central limit theorem. This chart is always used with another chart like the x and r chart or the x and s chart.
Hear r chart shows the ranges of the variables. And s chart shows the standard deviation of sample variables. If we are going to calculate manually then the r chart is preferred use. The ranges are easy to calculate than the standard deviation. It depends on the type of variation chart used. The average range of the sample or the average standard deviation of the sample is used to derive the x-bar charts' control limits.