SMCM Psychology and Statistics Collection contains a group of equations created by Caroline Robertson (Caroline4) and reviewed by Richard Platt (rplatt).  Caroline Robertson is a student at St. Mary's College of Maryland and created this set of equations as a part of a summer research program designed to develop calculators for vCalc.  The purpose of this program was to develop equations that could be used in educational settings.  Richard Platt is an Associate Professor of Psychology at St. Mary's College of Maryland.  He reviewed the equations for accuracy and usefulness as educational aids.  There are a variety of equations here that include most of the ones most commonly encountered in a Psychological Statistics course.  In addition to the equations, there is a collection of decision trees that can help with deciding what statistical test is appropriate.  There are also a number of other equations that come from a variety of other areas of psychology including psychophysics, learning, and decision-making.