Creating 99 percent confidence interval

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Reference no: EM13100770

The mean lifetime of all light bulbs produced by a manufacturer is unknown. A sample of 144 bulbs is randomly selected and tested. The average lifetime of this group is measured and found to be 1500 hours with a sample standard deviation of 120 hours.
What is the point estimate for the population mean?
Construct the 99% confidence interval estimate for the true population mean.

Reference no: EM13100770

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