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    SolFar Posts: 3, Reputation: 1
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    Jan 20, 2014, 01:55 PM
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    Find 90% confidence interval for the lifetime of batteries, if the random sample of 12 batteries, gave the sample mean 32,4 hours and sample standard deviation 5,9 hours. It is assumed, that the lifetime of batteries in whole population is governed by normal distribution.

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