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Confidence interval for the average life of a battery

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Reference no: EM131694120

Question: The manufacturer of batteries used in small electric appliances wants to estimate the average life of a battery. A random sample of 12 batteries yields x¯ = 34.2 hours and s = 5.9 hours. Give a 95% confidence interval for the average life of a battery.

Reference no: EM131694120

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