Approximate is better than exact for interval estimation of binomial proportions. Agresti, A. & Coull, B. A The American Statistician, 52(2):119–126, Taylor & Francis, 1998.
bibtex   
@article{agresti1998approximate,
  title={Approximate is better than exact for interval estimation of binomial proportions},
  author={Agresti, Alan and Coull, Brent A},
  journal={The American Statistician},
  volume={52},
  number={2},
  pages={119--126},
  year={1998},
  publisher={Taylor \& Francis}
}

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