This article comes from MailChimp research team. If you ever wonder what the best way to utilize the A/B testing campaign type in MailChimp, this little graphic below will give you the quick gist into the 7 year experiment.
Download it, Print it out and Stick it on the wall!
If you want to read more about it and get all the details, go here.
I love this! It will definitely be a huge help in the campaigns I run, hope it does for you too.