Random Samples of Four Items Are Selected from a Manufacturing

question 121

Multiple Choice

Random samples of four items are selected from a manufacturing process at regular intervals and a certain quality characteristic is measured. After 25 samples, ΣX = 15,350 and ΣR = 411.4. To construct a range chart, what is the upper control limit (UCL) for the range?

• A) 37.553
• B) 411.4
• C) 0.00
• D) 102.85

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