Sampling error, however, is oversimplified when presented as a single number in reports that may include subgroups, poll-to-poll changes, lopsided margins and results measured on the difference ...

Serious polling requires careful data collection and careful adjustment. It doesn't mean much to say your poll is a "probability sample" when your nonresponse rate is 90 percent.

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Melbourne's boil water was rescinded Aug. 29; E. coli bacteria had been detected Aug. 28 during routine water samples.

The margin of sampling error for the full sample of 1,453 parents is plus or minus 3.2 percentage points. The survey was conducted by Ipsos Public Affairs in English and Spanish using KnowledgePanel, ...

For example, a recent campaign involved whole tubs of butter being given to London commuters, a strategy with several shortcomings: Sampling a whole product that lasts for weeks in the fridge isn ...

While representative sampling is one of the most effective methods used to reduce error, it is often not enough to do so sufficiently on its own.

The Court of Appeals for the Sixth Circuit has ruled that sampling is illegal, even when the sample in question is an essentially unrecognizable snippet. The case at issue here involved a two ...