My research question is: ''Does alcohol usage and breathing exercise's effect on reducing excitement differ in women and men ?''
I have 2 within-subject variables: breathing and alcohol use, and 1 between-subject variable, gender. I want to do pre/post experiment which has high internal validity. I think that I can use pre test- post test control group design but I couldn't use this design. How can I use control group with these within subject design ? If I use control group, will I distort the within subject variables in my design ?