The study is based on a random sample of one hundred ethnic neighborhood residents.
It was based on a random sample of 1,199 Palestinians, and has a margin of sampling error of plus or minus 3 percentage points.
The survey was based on a random sample of 17,000 middle and high school students in Colorado.
(By comparison, most respected public opinion polls depend on a random sample of 1,000 to 2,000 people).
Tests by The Observer on a random sample of journeys found that, although some routes could be broadly described as sensible, much of the advice is farcical.
The new study was based on a random sample of 200 of the commenters and analysis of publicly available information on their Facebook pages over two years.
But the figure was not based on a random sample and thus is not representative of the entire migrant population traveling through Mexico.
The Government could save time and provide better service if it collected such information on a random sample of 6,000 to 10,000 calls.
The survey was not based on a random sample, so it may not be representative of all visitors to washingtonpost.com, to say nothing of all Americans.
The poll was not based on a random sample, but included only people who chose to participate, and therefore is not representative of the population being studied.
Design and Setting: A postal survey was conducted on a random sample of 230 GPs in Norway.
