StatPrimer is "an online, public-domain biostatistics instructional manual." Biostatistics, in this case, can be somewhat misleading; the material covers many universal statistics concepts, but applies them to data sets and examples involving biology. Anyone wanting to learn about hypothesis testing, confidence intervals, regression, and several other statistical topics will find this site a valuable resource. The material is broken up into twenty sections, each with a particular theme or focus. Sample exercises follow each section, and answers are provided for the odd numbered questions. Appendixes are included that give tables of statistical parameters.