It is pretty easy to determine things (with a high degree of confidence) about a large group of people having only encountered a small group of people.
Of course how you sample is vital. With random sampling, it is pretty straightforward Stats 101 stuff. This wasn't random sampling which throws a wrench in it, but neither are these individual people actually independent. They were all selected by the organization they belong to.
Of course how you sample is vital. With random sampling, it is pretty straightforward Stats 101 stuff. This wasn't random sampling which throws a wrench in it, but neither are these individual people actually independent. They were all selected by the organization they belong to.