Interval estimation is a way of estimating a number using a range of numbers. It helps you to know how much you can trust your estimate. For example, let's say you wanted to estimate how many people live in a certain city. You might look at the census data to get an idea of how many people live there. With interval estimation, you can come up with an estimate that is within a given range, so you have an idea of how close the actual number might be. For example, if the census data says that the population of the city is between 100,000 and 200,000 people, you might use interval estimation to come up with a range of 95,000 to 205,000 people. That way, you know that you are estimating between 95,000 and 205,000 people, so you understand that the actual population could be slightly higher or lower than that range.