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Survey facts & stats

4 sourced facts about surveys and public-opinion polling, each with the context behind the number. 4 more are in today's round and appear here after it closes.

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Going deeper

By 2018, about what share of people contacted for a Pew telephone poll actually responded?

Answerabout 6%

Telephone survey response rates have fallen dramatically from around 9% just a few years earlier.

Source: Pew Research Center (2018) pewresearch.org

Expert level

About how many robocalls are placed in the U.S. per month, a trend blamed for lower survey response rates?

Answerabout 3.4 billion/month

The flood of robocalls has made people warier of answering unknown numbers, including legitimate pollsters.

Source: Pew Research Center (2018) pewresearch.org

To cut a poll's margin of error down to about ±1%, roughly how many people need to be sampled?

Answerabout 10,000

Shrinking the margin of error further requires a much bigger, and more expensive, sample.

Source: Wikipedia, Opinion poll (2023) en.wikipedia.org

Since 2015, Singapore's election sample counts have used about what margin of error, at a 95% confidence interval?

Answer4% margin of error

Sample counts give an early, statistically bounded indication of results before full vote counting finishes.

Source: Wikipedia, Sampling (statistics) (2015) en.wikipedia.org

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