about 10,000 people
About how many people would a poll need to reach a margin of error of just ±1%?
Cutting the margin of error to a third requires roughly ten times as many respondents.
Source: Wikipedia - Opinion poll (2024) en.wikipedia.org
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About how many people did the Literary Digest survey before wrongly predicting the 1936 US election?
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about 60–70%
One study found surveys with a response rate near 20% were about as accurate as surveys with a response rate near what higher figure?
This counterintuitive finding suggests a much higher response rate doesn't always mean a more accurate survey.
Source: Wikipedia - Response rate (survey) (2024) en.wikipedia.org
1938
In what year did researcher Paul Lazarsfeld develop the 'panel' survey method still used today?
Panel surveys ask the same group of people the same questions repeatedly over time to track how opinions change.
Source: Wikipedia - Sampling (statistics) (2024) en.wikipedia.org
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