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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
manufacturer lasted a mean of
AAA batteries produced by this
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 complete the
table below.
Carry your intermediate computations to at least three decimal places. Round
your answers to at least two decimal places.
1. What is the lower limit of the 99% confidence interval? ___
2. What is the upper limit of the 99% confidence interval? ___