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The weekly earnings of students in one age group are normally distributed with a standard deviation of 75 dollars. A researcher takes a random sample

  1. The weekly earnings of students in one age group are normally distributed with a standard deviation of 75 dollars. A researcher takes a random sample of 30 students and finds a sample mean of 250 dollars and sample sd of 65 dollars. Find the 99% confidence interval for the population mean .
  2. If the researcher were to take another random sample give an example of what the 99% confidence interval of that sample would be and explain why.

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