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

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Statistics

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

  1. Determine the standard error of the mean. (Round youranswer to 3 decimal places.)
  2. Determine the 99% confidence interval for the population mean.(Use z Distribution Table.) (Round your answers to3 decimal places.)

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