A behind-the-scenes blog about research methods at Pew Research Center. For our latest findings, visit pewresearch.org. Ask a survey methodologist to explain random sampling, or how non-probability ...

Learn how acceptance sampling improves quality control by evaluating random samples. Discover its methods, benefits, and historical significance in manufacturing.

Discover how simple random sampling ensures accurate and unbiased population research, offering efficiency and fairness over ...

International surveys provide information about how people in different countries are thinking about issues, but polling in different parts of the world can be very challenging because what works in ...