Step-3:Īfter selecting the “X-bar & Range chart”, such dialog box will appear on the screen. ![]() Just follow the step-2 to step-5 in the above figure to select the “Average & Range” type control chart. If you would like to know the selection process of different types of Control Chart then read the articles as “ What is SPC?”. ![]() Now we are supposed to select the Average and range type Chart (because length readings are variable data and we have taken subgroup size is 5). Length of Block=120☑mm, Subgroup Size=5, Sample frequency=5 sample perĪs you can see in the above figure, the same 100 numbers reading has been entered in box no.1.
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