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In a study of 100,000 online surveys, about how much did response rate drop by the time a survey hit 10 questions?

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about 6%

In that same research, about how much did response rate drop by 20 questions?

Doubling the question count from 10 to 20 roughly doubled the drop in response rate, but the effect is smaller than most people assume.

Source: Survey methodology research, cited via Wikipedia (2010) en.wikipedia.org

about 10% total

By 40 questions, how much further did the response rate fall compared to a shorter survey?

Counterintuitively, drop-off slows at high question counts — people who stick around past 20 questions tend to finish.

Source: Survey methodology research, cited via Wikipedia (2010) en.wikipedia.org

under 20 words

What is the commonly recommended maximum word count for a single survey question?

Survey design guidance favors short, plain-language questions because long or complex wording confuses respondents and hurts data quality.

Source: Wikipedia, survey methodology (2024) en.wikipedia.org

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