I need you help urgently, and I want to thank you all for that.
My question is as follows,
I have two groups’ j and k and I have two conditions, condition A and condition B
Group j has 29 members and group k has 623 members,
What I want to test here is, if the members in group j (N=29) have a significant change in condition B compared with A, against the change of the K (N=623) group from condition A to condition B. Since the K group have a higher group size it has stable mean. However, the J group has a smaller group size and the mean can change easily.
Can you suggest me any means (statistical test) I can use.
I tried to take the 30 from group J and randomly selected 30 from K and did a test, but I am not sure if I am doing the right thing. The group size is worrying me a lot.
Thank you very much
With kind regards