Representative Samples: What Percentage of the Population Is Needed?

Discover how to determine the ideal percentage of a population for a representative sample to ensure accurate data analysis with minimal sampling error.
Pew Research Center

Appendix A: Survey Methodology

Survey data in this report are based on Pew Research Center surveys conducted with a nationally representative sample of Hispanics. Differences between groups or subgroups, such as foreign-born and ...
National Academies of Sciences%2c Engineering%2c and Medicine

Methodological Advances in Cross-National Surveys of Educational Achievement

Cochran (1977) outlines eleven steps in the planning of a survey. Good sampling methods must exist in the environment of all of these steps. These steps are (1) a statement of the survey objectives, ...
JSTOR Daily

Using Standard Tools From Finite Population Sampling to Improve Causal Inference for Complex Experiments

This article considers causal inference for treatment contrasts from a randomized experiment using potential outcomes in a finite population setting. Adopting a Neymanian repeated sampling approach ...
National Academies of Sciences%2c Engineering%2c and Medicine

Using the American Community Survey: Benefits and Challenges

For decades, policy makers, planners, researchers, the media, and the public have looked to the decennial census as the source of detailed information on the numbers and characteristics of the U.S.
Pew Research Center

Appendix A: Survey methodology

About Pew Research Center’s Spring 2025 Global Attitudes Survey Results for the survey are based on a mix of telephone, face-to-face and online interviews ...