All professional ethics are dependent on the epistemology of the profession. The possibility of following a code of ethics, whether the official one or an alternative code, is dependent on being able to obtain knowledge and understand the world. Professional knowledge has to be based on inferences from limited information. Statistics provides the optimal methods for making such inferences, and thus ethical professional conduct requires individual or collective understanding of some statistical thcory and practice. This is demonstrated using the medical (...) profession as an example. Statistical methods are essential in all areas of medicine, in routine medical practice, in screening for disease and in research. Evidence from medical journals, textbooks and research bodies shows that the statistical basis for ethical conduct is lacking. However, there are attempts to improve the situation. (shrink)