Twenty samples of subgroup size of 4 (n style=”color:rgb(0,0,0);”> = 4) were collected for a variable measurement. Determine the upper control limit (UCL) for an R-chart if the mean of the sample ranges equals 4.4.  Factors for calculating control limitsn            A2         D3         D42            1.880   0            3.2673            1.023   0            2.5744            0.729   0            2.2825            0.577   0            2.1146            0.483   0            2.004

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