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The Mean of the Sample Means and the Pooled Standard xˉ\bar { x }

Question 34

Multiple Choice

The mean of the sample means and the pooled standard deviation of 25 samples of size 4 taken from a production process under control are found to be 150 and 10,respectively.The centerline for the xˉ\bar { x } chart is:


A) 150
B) 100
C) 250
D) 6

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