Diameter measurements of 15 roller bearings made by a lathe for one week showed a mean of 1.824 inches. The long-term process standard deviation is 0.064 inches. What is the 95% confidence interval of the mean diameter of all roller bearings? 1.815 AND 1.833 OR 1.792 AND 1.856 OR 1.521 AND 2.838

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Diameter measurements of 15 roller bearings made by a lathe for one week showed a mean of 1.824 inches. The long-term process standard deviation is 0.064 inches. What is the 95% confidence interval of the mean diameter of all roller bearings?

1.815 AND 1.833
OR
1.792 AND 1.856
OR
1.521 AND 2.838
 
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