OpenIntro Statistics is a free textbook for introductory statistics. We know quality is key, and we've spent thousands of hours to make this textbook ready to compete on any stage. The book can be downloaded for free as a PDF or purchased on Amazon.com for $9.02.

Click links to download individual chapters, appendices, or the textbook's source files.

Data sets in the book are distributed in an R package located on the Comprehensive R Archive Network. Many functions are also included in the package that were used to create the many figures in the textbook.

Normal, t, and chi-square probability distribution tables in a printer-friendly PDF. Or if you'd rather customize the tables, download the LaTeX source.

Many of the data sets used in the textbook are included in the zipped file below. These data sets are also contained in the OpenIntro R package.