My hypothetical experiment is a pretest posttest nonequivalent control group quasi experimental design. I am testing the effectiveness of a math anxiety intervention between two middle school pre-algebra classes from the same school. I understand that internal validity is an issue with non-equivalent control group designs. What tests are suitable to determine whether the two groups are suitable to use? Also, what is the best approach to analyze data? If I am looking at mean scores for pretest and posttest, do I use ANOVA testing? I have read that this might not be the best choice.
Daniel Wright Good idea. Here's a paper that is worth looking at in a time of pandemics and Dare I Say It DT, Look at Follow ups as well.
Article Simpson's Paradox, Lord's Paradox, and Suppression Effects a...
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