1. The problem statement, all variables and given/known data I'm trying to test a hypothesis that sending people both an email announcement and direct mail announcement produces significantly more enrollments in a free webinar than email or direct mail alone. I'd like to do an analysis on these groups created from 400 people selected from our database and randomly assigned. 100 People who received neither email nor direct mail from us 100 People who received an email only 100 People who received a direct mail piece only 100 People who received both and email and direct email piece Is a chi square analysis the right way to go about this? Do I need the "control group" who received no communication? 2. Relevant equations Chi square analysis 3. The attempt at a solution I think I would set up the groups like this attachment - when I get data. I've just made up some data for now. Thanks!