Participants were randomly allocated to one of two stress management therapy groups (group A vs. group B), or a waiting list control group. Their baseline levels of stress were measured before treatment, and again after 3 months of weekly therapy sessions. Therefore, the covariate in the model is baseline stress levels.

Question:

Please write out the regression equation that represents this model. (Remember, you aren't including the actual b-values, just writing out the regression model)