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Random Samples of 4 Items Are Selected from a Manufacturing Σ\Sigma

Question 20

Multiple Choice

Random samples of 4 items are selected from a manufacturing process at regular intervals and a certain quality characteristic is measured. After 25 samples, Σ\Sigma X = 15,350 and Σ\Sigma R = 411.4
What is the sample size?


A) 4
B) 25
C) 100
D) 20

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