AcaStat and Clarity Software Downloads The free statistical software demos allow students to analyze data containing up to 100 observations. Applied Statistics iBook The free Applied Statistics iBook is an updated and expanded version of StatBook. It provides a review of hypothesis testing and guides the interpretation of output generated by statistical software. Student Workbook Provides instruction for using AcaStat or SPSS with StatCalc or Clarity with StatCalc. Version 4 contains the solutions in the Appendix.