# which statistical procedure shall I use to compare tests applied to the same goup of students?

I want to compare 3 different tests applied to the same group of students at the same occasion. Is an ANOVA the right procedure? If so which type? And what exactly doess ANOVA give that a correlation won't? Thanks

Normal test scores, Block ANOVA. First, suppose the test scores are nearly normal. If you were comparing only two tests, then a paired t test would be the appropriate procedure. The generalization of 'pair' for more than two is 'block'. So you can do a block ANOVA. In this simple case, a block ANOVA is equivalent to a two-factor ANOVA, where the main effect is 'Test type' with levels A, B, C. The other factor 'Student' is random, with levels $$1, 2, \dots, n,$$ for the $$n$$ students in the group. Each of the $$3n$$ cells in the design will have one test score.