The margin of error, the plus or minus 3% in the above example, decreases as the sample size increases. This is only to a ...

"The polling industry is going through what I would call a paradigm shift, where we're moving from the types of methods that worked 30, 40 years ago and don't really work anymore," Smith said.

Pollsters don't have that kind of time — or money — so they use smaller samples of the population. They seek to identify representative samples in which all members of the larger group have a ...

"The polling industry is going through what I would call a paradigm shift, where we're moving from the types of methods that worked 30, 40 years ago and don't really work anymore," Smith said.

"The polling industry is going through what I would call a paradigm shift, where we're moving from the types of methods that worked 30, 40 years ago and don't really work anymore," Smith said.