I conducted pre- and post- tests (each graded with a quantitative score) among three different grade levels in a middle school where each grade level had a different number of students (23, 20, and 21 respectively).
What type of ANOVA test should I use??
My first thought was to use an "ANOVA: Two-Factor with Replication", but it cannot be completed without equal sample sizes. I also thought about running two separate One-Way ANOVAs and subsequent Post Hoc tests, but that would give me too small of an alpha because of so many tests. Thank you in advance for your help!