And that brings us to observational study because that's what an observational study is all about. Can we draw a connection? Can we draw a positive or a negative correlation between variables based on observations? So we've surveyed a population here, the farmers in Great Britain, and we are able to draw some type of connection between these variables. And so this is clearly an observational study. Now, this is not an experiment. If there was an experiment, we would take the farmers and we would randomly assign them into one or two groups.