It is assumed that people are not seeking for help when they need to, therefore a program is implemented to teach them when to seek help. People can join the program voluntarily. I would like to study the effectiveness of the program one year after it implementation, i.e., is there any significant difference between two groups (those who joined the program and those did not) in the way they seek.
1) I am using quantitative causal-comparative research design. Am i correct?
2) I am not sure what type of analysis should be use for this design. Paired t-test? But I do not have pre-data.