Which statistical test should I run?

I created an introvert/extrovert scale for this cl Im in. Our professor wants us to create fake data-which I did. The scoring goes from 0-81, and I have 13 participants. I want to be able to distinguish between introverts (lower scores), extroverts (highest) and undifferentiated (not statistically significant). I SUCK at stats and have NO idea where to start. I want an alpha of .05 if that helps any. No male/female differences need to be reported. Please help :)