Six samples of subgroup size 7 (n = 7) were collected. Determine the upper control limit (UCL) for an

X-bar chart if the mean of the sample averages is 4.7 and the mean of the sample ranges is 0.35.

 n            A2        D3          D4

 2            1.880   0            3.267

 3            1.023   0            2.574

 4            0.729   0            2.282

 5            0.577   0            2.114

 6            0.483   0            2.004

 7            0.419   0            1.924  

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