Question: In a manufacturing process,a random sample of9bolts has a mean length of5inches with a variance of.09 What is the90percent confidence interval for the true mean

In a manufacturing process,a random sample of9bolts has a mean length of5inches with avarianceof.09

What is the90percent confidence interval for the true mean length of the bolt?

(Hint:problem8.16;how to achieve the value of the standard deviation based on the variance value?Page110, Essentials-of-Business-Statistics-5th-edition).

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