How well the sample represents the population relies on two important statistics – the survey’s margin of error and confidence level. They tell us how well the spoonfuls represent the entire pot.

Understanding the confidence interval will help you grasp what an election poll is -- or is not -- saying. As you might have guessed, the media consistently gets it wrong.

In the last year, statistics have been unusually important in the news. How accurate is the COVID-19 test you or others are using? How do researchers know the effectiveness of new therapeutics for ...