So if you wanted the true mean height of all of the men in the United States, you would have to somehow survey, or not even, you would have to be able to go and measure all 150 million men. And even if you did try to do that, by the time you're done, many of them might have passed away, the new men will have been born, and so your data will go stale immediately. So it is seemingly impossible, or almost impossible to get the exact height of every man in the United States in a snapshot of time. And so instead, what you do is say, well look, okay, I can't get every man, but maybe I can take a sample, I could take a sample of the men in the United States, and I'm going to make an effort, I'm gonna make an effort that it's a random sample. I don't wanna just go sample 100 people who happen to play basketball, or play basketball for their college. I don't wanna go sample 100 people who are volleyball players. I wanna randomly sample, just maybe the first person who comes out of a mall in a random town, or in several towns, or something like that, something that should not be based in any way, or skewed in any way, by height.