A random sample of 12 batteries yields x-bar 34.2 hours, Ask an Expert

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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-bar = 34.2 hours and s = 5.9 hours. Give a 95% confidence interval for the average life of a battery.

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Category:- Statistics and Probability
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