Mathematics, 25.11.2021 08:20 briashia

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 AAA batteries produced by this manufacturer lasted a mean of hours with a standard deviation of hours. Find a 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.

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