Mathematics, 12.03.2021 14:50 biggiecheese93

A manufacturer produces piston rings for an automobile engine. It is known that ring diameter is normally distributed with millimeters. A random sample of 15 rings has a mean diameter of x=74.106. Required:
a. 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.
b. Calculate the 99% two-sided confidence interval on the true mean piston diameter.
c. Calculate the 95% one-sided lower confidence interval on the true mean piston diameter.

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A manufacturer produces piston rings for an automobile engine. It is known that ring diameter is nor...

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