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In what year did George Gallup found what became the Gallup Organization?

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about ±3%

For a poll of 1,000 people showing about 50% on a question, what is the typical margin of error?

A random sample of 1,000 people gives a margin of error around ±3% for a result near 50% — cutting that to ±1% would need about 10,000 respondents.

Source: Wikipedia (Opinion poll) (2022) en.wikipedia.org

about 10%

About what share of people contacted for a survey actually respond, in recent years?

Survey response rates have fallen dramatically, down to roughly 10% in recent years, from much higher rates decades ago.

Source: Wikipedia (Opinion poll) (2022) en.wikipedia.org

1932

The Likert scale — the common 'strongly disagree to strongly agree' survey format — was invented in what year?

Psychologist Rensis Likert introduced his now-ubiquitous rating scale in a 1932 paper, and it remains the most widely used survey response format.

Source: Wikipedia (Likert scale) (2022) en.wikipedia.org

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