Newborn weight

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Newborn weight. 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:

a)    n = 81 and = 7.0 pounds

b)   n = 9 and = 7.0 pounds

c)    Which sample provides the most precise estimate of the mean birth weight?

d)   Interpret the CI you computed in part a).