brand new to statistics, but trying to develop a statistical plan for a class project (Biostats 1)
I have a continuous, normally distributed outcome measure that I want to measure at baseline in the control and intervention groups, and then again after the intervention. I was told that because there is likely correlation between the measurements, that I would need to do repeated measures ANOVA. Other people have said that because it is only two timepoints, I can simply perform a 2x2 ANOVA assuming sample independence. I also need to calculate a sample size somehow. Can anyone help? Thanks in advance!