Statistics · 35 s
Why a poll lead can be a tie
A 3-point lead can be a tie.
The catch. A decent poll of about a thousand people has a margin of error of roughly three points, for each candidate’s number on its own.
Actually. The gap between two candidates is about twice as shaky, around six points either way. A three-point lead fits inside that easily.
The twist. That’s only the luck of the sample. Who actually turns up is harder to pin down.
How sure? “About twice” is Pew’s rule of thumb. The 48–45 bars here and in the video are an invented example, not a real poll.
Sources
- Understanding the margin of error (2016), Pew Research Center
- What are the polls telling us? (2026), Rutgers University
What the video says
A three-point lead in a poll can actually be a tie.
A decent poll of about a thousand people has a margin of error of roughly three points, for each candidate's number on its own.
The gap between two candidates is about twice as shaky, around six points either way. A three-point lead fits inside that easily.
That's only the luck of the sample. Who actually turns up is harder to pin down. So when a headline shouts about a lead, check the margin first.