Pew Research Center

FOR RELEASE MAY 12, 2017

Video Explainer: Understanding random sampling for public opinion surveys

The first video in our "Methods 101" series is about random sampling, a concept that undergirds all probability-based survey research. Here's how it works.

FOR MEDIA OR OTHER INQUIRIES:

Communications Department
202.419.4372
www.pewresearch.org

RECOMMENDED CITATION

Pew Research Center, May 2017, "Video Explainer: Understanding random sampling for public opinion surveys"

About Pew Research Center

Pew Research Center is a nonpartisan, nonadvocacy fact tank that informs the public about the issues, attitudes and trends shaping the world. It does not take policy positions. The Center conducts public opinion polling, demographic research, computational social science research and other data-driven research. It studies politics and policy; news habits and media; the internet and technology; religion; race and ethnicity; international affairs; social, demographic and economic trends; science; research methodology and data science; and immigration and migration. Pew Research Center is a subsidiary of The Pew Charitable Trusts, its primary funder.

© Pew Research Center 2026

Table of contents

  • About Pew Research Center

Video Explainer: Understanding random sampling for public opinion surveys

The first video in our "Methods 101" series is about random sampling, a concept that undergirds all probability-based survey research. Here's how it works.

The first video in our “Methods 101” series is about random sampling, a concept that undergirds all probability-based survey research. Here’s how it works.