Mathematics, 02.12.2019 07:31 kaylam5599

The lifetime of a certain brand of battery is known to have a standard deviation of 9 hours. suppose that a random sample of 70 such batteries has a mean lifetime of 37.8 hours. based on this sample ,find a 99% confidence interval for the true mean lifetime of all batteries of this
brand. then complete the table below.

what is the lower limit of the 99% confidence interval?
what is the upper limit of the 99% confidence interval?

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