An Example of Margin of Error and Confidence Levels The key to the validity of any survey is randomness.

As the director of the Quinnipiac University Poll, which has been taking the pulse of the public on policy issues and elections for the past 30 years, I’ve noted that people have been paying ...

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.

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.

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