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

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… ...

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.

The confidence interval for the larger sample will be between 67% and 73% with a margin of error of 3%.

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 ...

Although Gallup”s two polls differed by a total of 12 percentage points, they were both within the margin of error, meaning they were statistically tied.