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A 2010 study of 100,000 online surveys found response rates dropped by about how much by question 20?

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surveys, polling and public-opinion research
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from about 9% to 6%

From roughly 9% in earlier years to 6% by 2018, how much did Pew's phone survey response rate fall?

Despite the decline, Pew's own research found response rates weren't a reliable predictor of a poll's accuracy.

Source: Pew Research Center (2018) pewresearch.org

about ±3%

For a poll of about 1,000 people, what's the typical margin of error?

A sample of 500 to 1,000 people is the typical compromise pollsters use to balance cost against accuracy.

Source: Wikipedia: Opinion poll en.wikipedia.org

99%

About what share of the world's adult population does Gallup's World Poll now cover?

Gallup surveys people in more than 160 countries to reach that level of coverage.

Source: Gallup (2005) gallup.com

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Each question asks you to guess a real number about surveys, polling and public-opinion research. After you answer you see how everyone else guessed, then the real figure and where it comes from.

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Four stats and one opinion poll. A correct guess earns 100 points plus up to 50 for speed, with a combo bonus for answers in a row. The range next to the right answer earns 40. Opinion polls earn 25 for having your say, and nailing every stat adds 150.

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