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###### A rechargeable flashlight is advertised to last up to 2 1/2 hours per charge and to...

A rechargeable flashlight is advertised to last up to 2 1/2 hours per charge and to recharge overnight. A test was conducted which measured the time a light lasted before needing a recharge. A random sample of 12 lights has a mean recharge time of 2.13 hours and a standard deviation of 1.06 hours. What is the 99% confidence interval estimate for the population mean?

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