You want to develop a three-sigma R-chart. You know the average range is 5 based on several samples of size 10. Which of the following is the resulting UCL?
Fill in the blank(s) with the appropriate word(s).
8.9
From Exhibit 13.7, n = 10, D4 = 1.78. UCL = R-bar times D4 = 5 × 1.78 = 8.9.
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