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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

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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

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