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Six samples of subgroup size 7 ( n = 7) were collected. Determine the upper control limit (UCL) for an X-bar chart if the mean

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.

Factors for calculating control limits

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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