Here is a short description of the analysis-tools: SS = Sum of Squares MS = Mean Square (MS = SS/df) df = degree of freedom Multiple R = Multiple Regression R Square = coefficient of determination, but in some langs mathematics use R^2, so ask your math teacher :) ANOVA = ANalysis Of VAriance Ask if you want :) Valek and Kenneth Created with help from Pete. t-test: technically called Student's t-test F-test: used to test whether the variances of two samples are different Named after Fischer t-test: used to test whether the means of two samples are different http://stat.ethz.ch/R-alpha/library/base/html/t.test.html http://www.statsol.com/tools/stattools/ttestindependenttoolhelp.html