👍 Agree.
"I have no formal research experience. However, I found my coursework in Statistical Methods in Psychology to be very interesting, and I led my group in creating, administering, and writing up a study that served as the final exam for the class."
Something like that. I wouldn't go too much longer, as you don't really have too much to say, and you don't want to seem like you're pigeonholing a non-research activity into the research category.
And don't worry too much about it. You don't need research to get into medical school - it's just a nice plus.