Inc. BarCharts 
Statistics Equations & Answers [PDF ebook] 

Statistics problems can make the best students shudder as they near the classroom, but they need not worry any longer Quick Study is here to help! A comprehensive, up-to-date collection of tips and tricks for understanding statistics/probability is contained in this 3-panel (6-page) guide, which is designed with easy-to-use icons to help students go right to the equations and problems they most need to learn, and also call out helpful tips to use and common pitfalls to avoid.