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

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.

If a margin of error is plus or minus 3 percentage points, the margin of error on the difference between them is about double – or 6 percentage points, in this example.

Polling experts are questioning whether the margin of error is a useful metric. Some say it should be banished.

Conducting a poll isn’t an exact science. The process is susceptible to lots of common problems and baked-in biases — more than just the “margin of error.” ...

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.

Understanding the margin of error is key to interpreting political polls' accuracy.

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

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 ...