Life tests performed on a sample of 13 batteries of a new model indicated: (1) An average

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Life tests performed on a sample of 13 batteries of a new model indicated:

(1) An average life of 75 months,

(2) A standard deviation of 5 months. Other battery models, produced by similar processes, have normally distributed life spans. The 98% confidence interval for the population mean life of the new model is _________.

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Related Book For  answer-question

Applied Regression Analysis and Other Multivariable Methods

ISBN: 978-1285051086

5th edition

Authors: David G. Kleinbaum, Lawrence L. Kupper, Azhar Nizam, Eli S. Rosenberg

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