Question: A study is going to be conducted in which a mean of a lifetime of batteries produced by a certain method will be estimated using

A study is going to be conducted in which a mean of a lifetime of batteries produced by a certain method will be estimated using a 90% confidence interval. The estimate needs to be within +/- 2 hours of the actual population mean. The population standard deviationsis estimated to be around 25. The necessary sample size should be at least?

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