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question 29 Life tests performed on a sample of 13 batteries of a new model indicated: (1) an average life of 75 months, and (2)

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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, and (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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