And these are the scores on the test. So this is food 1, this is food 1, this is food 2, this is food 2, and then this right over here is food 3. And I want to figure out if the type of food that people take going into the test, does it really affect their scores? Are the differences in these scores, if you look at these means, it looks like they perform best in group 3, then in group 2, or then in group 1. But is that difference purely random, random chance? Or can I be pretty confident that it's due to actual differences in the population means of all of the people who would ever take food 3 versus food 2 versus food 1? What I want to do is say, so my question here is, are the true population means the same?