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A sample of 250 observations is selected from a normal population with a population standard deviation...

A sample of 250 observations is selected from a normal population with a population standard deviation of 23. The sample mean is 18.

  1. Determine the standard error of the mean. (Round your answer to 3 decimal places.)
  1. Determine the 99% confidence interval for the population mean. (Use z Distribution Table.) (Round your answers to 3 decimal places.)
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