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4 sourced facts about customer-feedback surveys and the science of getting good answers, each with the context behind the number. 4 more are in today's round and appear here after it closes.

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The basics

In what year did consultant Fred Reichheld introduce the Net Promoter Score in a Harvard Business Review article?

Answer2003

The article, titled 'The One Number You Need to Grow,' popularized NPS as a simple customer-loyalty metric.

Source: Wikipedia (2025) en.wikipedia.org

What sample size do most national customer or opinion surveys typically use to get a reliable read?

Answerabout 500 to 1,000 people

It's a practical middle ground that keeps costs down while still giving statistically useful results.

Source: Wikipedia (2025) en.wikipedia.org

Going deeper

A 2010 study of 100,000 online surveys found response rates had dropped by about how much once a survey reached 20 questions?

Answerabout 6%

The longer a feedback survey runs, the more people abandon it before finishing.

Source: Wikipedia (2010) en.wikipedia.org

Expert level

Sample surveys were introduced to Imperial Russia in which decade by statistician Alexander Chuprov?

Answer1870s

Chuprov helped bring modern sampling methods into Russian statistics well before they were common elsewhere.

Source: Wikipedia (2025) en.wikipedia.org

Think you'd have guessed them?Today's round is four stats like these plus one opinion poll. Your streak and level follow you to every site.Play today's round