We regularly make sweeping claims about our fellow Americans — “everyone’s getting divorced these days” or “most people are college-educated.” But a recent YouGov survey reveals these casual observations expose a fascinating gap in how we perceive the makeup of our population.
Americans consistently overestimate the size of minority groups while underestimating majority groups, according to polling data from two surveys of 1,000 U.S. adults each.
The surveys were conducted online in January 2022, using nationally representative samples weighted for demographics and voting patterns. Actual population figures came from sources including the U.S. Census Bureau and Bureau of Labor Statistics.
The misperceptions are dramatic. Here are the most overestimated groups from the YouGov survey:
- Transgender Americans: estimated 21%, actual 0.6%
- Muslim Americans: estimated 27%, actual 1%
- Gay and lesbian Americans: estimated 30%, actual 3%
- Native Americans: estimated 27%, actual 1%
- Black Americans: estimated 41%, actual 12%
Previous research on the tendency to overestimate the size of minority groups has pointed to media coverage, lack of exposure and fear as the cause for misperceptions and misestimates. But YouGov’s research challenges those explanations.
If fear or lack of exposure drove the misperceptions, minority group members would be expected to be more accurate about their own group’s size. And as YouGov explained in a summary of its findings, even minority group members dramatically overestimate their own numbers:
“We tested this theory on minority groups … and found that they were no better (and often worse) than non-group members at guessing the relative size of the minority group they belong to.”
For example, Black Americans think Black people comprise 52% of the population, but the data shows it’s closer to 12%. First-generation immigrants estimate their group at 40% when it’s about 14%.
Here are the most underestimated groups, according to the YouGov poll:
- High school graduates: estimated 65%, actual 89%
- Car owners: estimated 66%, actual 88%
- Christians: estimated 58%, actual 70%
- Homeowners: estimated 49%, actual 65%
Groups that hover around 50% get the most accurate estimates. Americans guessed 55% are married when 51% actually are, and estimated 58% have children when 57% do.
Researchers call this phenomenon “uncertainty-based rescaling.” When people are unsure about a statistic, they unconsciously adjust their guess toward 50% — the psychological middle ground that feels safer than extreme estimates.
The findings, according to YouGov, suggest the misperceptions are driven by a universal cognitive bias affecting how humans process uncertain information. So next time someone claims “most Americans” do something, these findings suggest it’s worth checking the actual numbers.
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