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In a manufacturing process a random sample of 36 bolts manufactured has a mean length of 7 inches with a standard deviation of 0.67 inches.

In a manufacturing process a random sample of 36 bolts manufactured has a mean length of 7 inches with a standard deviation of 0.67 inches. what is the estimator of the mean? What is the 99% confidence interval for the true mean length of the bolt? Can be the mean 7.9 inches?

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