This chapter introduces statistical tests to analyse the effectiveness of cooperative education. The hypothesis to test is whether there is a noticeable difference in certain outcomes between groups with and without cooperative education. Different tests are used for different types of data. Namely, a t test is used when a pair of numbers such as GPAs are compared, while z test or χ 2 test is used when a pair of proportions are compared. As briefl y mentioned in the previous chapter, when comparing three or more means, analysis of variance (ANOVA) based on an F test needs to be used. But as the main focus of this book is the comparison of two types – coop and non-coop students – a simpler t test can be used, which gives the identical result to ANOVA.