For example, a sample of 600 voters will have a larger margin of error – about 4 percentage points – than a sample of 1,000 voters, which has a margin of error of just over 3 percentage points.

Andrew Gelman, a professor in the departments of statistics and political science at Columbia University, explains. A "3 percent margin of error" means that there is a 95 percent chance that the ...

In the current election cycle, many media reports about polls are not including information about the margin of error.

In fallout over polls, "margin of error" gets new scrutiny Polling experts are questioning whether the margin of error is a useful metric. Some say it should be banished.

Ever wonder why some pollsters and pundits don’t talk about “margins of error” anymore when so confidently saying so-and-so is leading? Shad Plank got curious after seeing a Reute… ...

Ideally, a good sample should be representative of the total population, including gender, racial diversity, socioeconomic diversity, lifestyle patterns and other demographic measures.

As Americans await election results, many are looking to the polls for clues. From the margins of error to methodology, here’s what to know about presidential polls.