9.11 A machine produces metal pieces that are cylin- drical in shape. A sample of pieces is taken, and the diameters are found to be 1.01, 0.97, 1.03, 1.04, 0.99, 0.98, 0.99, 1.01, and 1.03...

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Answer 9.20

Extracted text: 9.11 A machine produces metal pieces that are cylin- drical in shape. A sample of pieces is taken, and the diameters are found to be 1.01, 0.97, 1.03, 1.04, 0.99, 0.98, 0.99, 1.01, and 1.03 centimeters. Find a 99% con- fidence interval for the mean diameter of pieces from this machine, assuming an approximately normal dis- tribution.


Extracted text: 9.20 Consider the situation of Exercise 9.11. Esti- mation of the mean diameter, while important, is not nearly as important as trying to pin down the loca- tion of the majority of the distribution of diameters. Find the 95% tolerance limits that contain 95% of the diameters.