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Lifetimes of AAA batteries are approximately normally distributed A manufacturer wants to estimate the standard...

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Lifetimes of AAA batteries are approximately normally distributed A manufacturer wants to estimate the standard deviation of the lifetime of the AAA batteries it produces A random sample of 16 AAA batteries produced by this manufacturer lasted a mean of 11 hours with a standard deviation of 1 8 hours Find a 90 confidence interval for the population standard deviation of the lifetimes of AAA batteries produced by the manufacturer Then give its lower limit and upper limit Carry your intermediate computations to at least three decimal places Round your answers to at least two decimal places If necessary consult a list of formulas Lower limit Upper limit X

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