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QUESTION
A statistician knows that the population of light bulb lifetimes is normally distributed and has a standard deviation of 30 hours.
A statistician knows that the population of light bulb lifetimes is normally distributed and has a standard deviation of 30 hours. A simple random sample of 36 bulbs yields a mean lifetime of 504 hours. Construct and interpret a 99% confidence interval for the mean lifetime of all such bulbs
