### X bar chart

X bar chart is a one type of the control chart that is used for the monitor of the arithmetic means of the constant size n of the successive sample. This type of the control charts are used for the things that can be measure for the continuously, like weight, temperature, thickness etc. Like in this method we can take the example of temperature in which the temperature of the everyday is different for the very week. The difference of each week is plot on the chart and makes the analyses of these continuous units of the temperatures. And in chart we put the seven value of each day. Looking for X Bar Chart Assignment Help? Call us now

In this if we calculate the control limit for each week, than the sample mean assumed to be normal distribution, and the assumptions are justified by the theorem that is known as central limit theorem. This chart is always used with another chart like x and r chart or x and s chart.

Hear r chart show the ranges of the variables. And s chart show the standard deviation of sample variables. If we are going to calculate manually than r chart is preferred to use. The ranges are easy to calculate than the standard deviation. It is depend on the type of the variation chart used. The average range of sample or the average standard deviation of sample is used to derive the x bar charts control limits.