In my stud, I have 2 groups (intervention and control Group). I performed tests twice (pre and post scores). I want to compare the significance of the changes between two times within two groups.
Hi, We can diagram your design this way:
Intervention Control
pre
post
Thus you would have two post-pre comparisons and two Intervention - control comparisions. The intervention - control tests are Welch t-tests and the post-pre comparisons are paired difference t-tests.. Be sure to check assumptions. Hope this helps. Best wishes, David Booth
Thanks for your reply. What would you recommend with little sample size and normal distribution. thank you again.
Intervention group is 12 participants, control group is 12 participants.
More data is better but if that is what you can get, try it. Do you mean you believe you have normal distributions or do you not believe that? What is your evidence?
D. Booth
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