What is the 95 confidence interval for the true mean length, Ask an Expert

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In a manufacturing process a random sample of 9 bolts manufactured has a mean length of 3 inches with a standard deviation of .3 inches. What is the 95% confidence interval for the true mean length of the bolt?

A. 2.804 to 3.196

B. 2.308 to 3.692

C. 2.769 to 3.231

D. 2.412 to 3.588

E. 2.814 to 3.186

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M9167028

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