Question: sample of size n=80 is drawn from normal population whose standard deviation is o=6.8 sample mean is x=40.41 construct 90% confidence interval of u if

  1. sample of size n=80 is drawn from normal population whose standard deviation is o=6.8 sample mean is x=40.41
  2. construct 90% confidence interval of u
  3. if the population were not approximately normal would the confidence interval constructed in part 2 be valid?

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