@article {Ehlenbach401, author = {William J Ehlenbach}, title = {Medical Statistics: A Textbook for the Health Sciences, 4th edition.}, volume = {54}, number = {3}, pages = {401--402}, year = {2009}, publisher = {Respiratory Care}, issn = {0020-1324}, URL = {https://rc.rcjournal.com/content/54/3/401}, eprint = {https://rc.rcjournal.com/content/54/3/401.full.pdf}, journal = {Respiratory Care} }