@inbook{1201606160, author={Susan E. White}, title={Preguntas de investigación sobre dos grupos separados o independientes}, booktitle={Bioestadística Básica y Clínica, 5e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2021}, url={accessmedicina.mhmedical.com/content.aspx?aid=1201606160} }