**All about Margin of error**

Before we understand margin of error, first let’s understand two key concepts: **population **and **sample**.

The population represents the entire group that you are interested in the study and the sample is the subset of the population. Since a sample is used to represent a population, the results drawn from the sample are expected to differ from what the result would have been if the entire population was surveyed. This difference is called the ** margin of error**.

Let’s understand by using an example….