Twenty samples of subgroup size of 4 n 4 were collected


Twenty samples of subgroup size of 4 (n = 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 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

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Mathematics: Twenty samples of subgroup size of 4 n 4 were collected
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