A 1976 study of women smokers over 30 years of age who delivered premature babies

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A 1976 study of women smokers over 30 years of age who delivered premature babies (fewer than 260 days of gestation) reported an infant survival percentage of 72%.  Suppose researchers would like to estimate the current survival proportion. Using the survival rate from the 1976 study as a preliminary estimate of the current survival proportion, compute the minimum sample size required to estimate the current survival proportion to within .05 with 95% confidence.