The Cambridge Dictionary of Statistics
REF QA276.15.E84 2002
Provides definitions and formulae.
Encyclopedia of Statistical Sciences
This nine-volume encyclopedia contains signed articles on topics and key statisticians. Each article includes a bibliography and list of key terms for reference to other articles; many contain formulae.
Standard Probability and Statistics Tables and Formulae
Ref QA273.3.Z95 2000
A very quantitative review of concepts with formulae and tables. The book is arranged by concept within chapters; use either the table of contents or index to find your statistic of interest.