That's super important, frankly, in all of statistics. So let's first look at a situation where our independence condition breaks down. So right over here, you can see that we are using our little gumball simulation. And in that gumball simulation, we have a true population proportion, but someone doing these samples might not know that. We're trying to construct confidence interval with a 95% confidence level. And what we've set up here is we aren't replacing. So every member of our sample, we're not looking at it and then putting it back in.