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A study takes a SRS from a population of full-term infants. The standard deviation of birth...

  1. A study takes a SRS from a population of full-term infants. The standard deviation of birth weights in this population is 2 pounds. Calculate 95% confidence intervals for μ for samples in which:
  1. n = 81 and mean = 7.0 pounds
  2. n = 9 and mean = 7.0 pounds
  3. Which sample provides the most precise estimate of the mean birth weight?
  4. Interpret the CI you computed in part a).
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