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Survey facts & stats

5 sourced facts about surveys, polling and public-opinion research, each with the context behind the number. 4 more are in today's round and appear here after it closes.

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Going deeper

For a typical political opinion poll with about 1,000 respondents, what is the usual margin of error?

Answerabout +/-3%

Cutting the margin of error to +/-1% would take roughly 10,000 respondents instead of 1,000.

Source: Wikipedia, Opinion poll (2024) en.wikipedia.org

Roughly how many employees does Gallup have worldwide?

Answerabout 1,500

Gallup operates 30 to 40 offices around the world.

Source: Wikipedia, Gallup (company) (2024) en.wikipedia.org

Expert level

When was the first known opinion poll conducted, tracking a US presidential race?

Answer1824

A North Carolina newspaper tallied straw votes showing Andrew Jackson ahead of John Quincy Adams.

Source: Wikipedia, Opinion poll (2024) en.wikipedia.org

About how many countries does Gallup's World Poll survey, covering most of the world's adults?

Answerabout 160 countries

That covers more than 98% of the world's adult population.

Source: Wikipedia, Gallup (company) (2024) en.wikipedia.org

During the 2000 US election, a Gallup tracking poll swung from an 11-point lead for one candidate to a 7-point lead for the other in just two days. How big was that swing?

Answerabout 18 points

Such wild swings raised questions about how tracking polls handle small, noisy daily samples.

Source: Wikipedia, Opinion poll (2024) en.wikipedia.org

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