Here, we just did the survey to everybody and we just asked them this question and we were able to find this connection between whether the cows were named and the actual milk yield. So clearly, not an experiment. This was an observational study. Now, the next thing is what can we conclude here? We know when, they're telling us that when the cows were named, it looks like there was a 258 liter higher yield on average. So the conclusion that we can strictly make here is like, well, for farmers in Great Britain, there is a correlation, a positive correlation between whether cows are named and the milk yield. So that we can say for sure.