Question: What is the UCL in a three-sigma R-chart, given the average range is 6 based on several samples of size 7? A) 8.9 B) 3.1
What is the UCL in a three-sigma R-chart, given the average range is 6 based on several samples of size 7? A) 8.9 B) 3.1 C) 7.02 D) 5 E) 11.52
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