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Mathematics, 13.12.2019 04:31 needhelpwithHW10

Amanufacturer produces piston rings for an automobile engine. it is known that ring diameter is normally distributed with σ=0.001 millimeters. a random sample of 15 rings has a mean diameter of x¯=74.021. construct a 99% two-sided confidence interval on the true mean piston diameter and a 95% lower confidence bound on the true mean piston diameter. round your answers to 3 decimal places.

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