Error bars illustrate the margin of error for a survey estimate by showing how precise that estimate is. Here are some answers to common questions that might help you better understand charts with ...

Doug Schwartz is affiliated with the American Association of Public Opinion Research (AAPOR). As the director of the Quinnipiac University Poll, which has been taking the pulse of the public on policy ...

I am a statistician, and part of my job is to make inferences and predictions. With unlimited time and money, I could simply test or survey the entire group of people I am interested in to evaluate ...

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. Candidate Gobermouch is ...