And so they draw a sample. The sample proportion right over here actually just happened to be 0.6. But then they could draw another sample. This time the sample proportion is 0.52, or 52% of those 50 gumballs happened to be green. Now you could say, all right, well, these are all different estimates, but for any given estimate, how confident are we that a certain range around that estimate actually contains the true population proportion? And so if we look at this tab right over here, that's what confidence intervals are good for. And in a previous video, we talked about how you calculate the confidence interval.