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.

Some of the better-known statistical rules of thumb that a smart consumer might think apply in polls are more nuanced than they seem. In other words, as is so often the case in life, it’s complicated.

Hold your breath and make sure you vote, because the result is likely to be a squeaker.

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 ...

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.