A study finds that a representative sample of people given wearable data collection devices provides more equitable and ...

When people read about a poll, they are often told something like this: Pollsters call a random group of people. Though small, we can infer this group is a representative sample of the U.S. population ...

Accurately sampling and testing hay is the only way to get a real understanding of the nutritive value of feed. Using values ...

Taking representative soil samples, choosing the right depths, and analyzing key nutrients can improve fertilizer planning ...

With more American households giving up their old-fashioned landlines and using cell phones for all calls, public opinion researchers are facing a challenge of how to make sure they are getting ...

Pew Research Center’s cross-national studies are fielded in a range of polling environments, from countries where telephone surveys are regularly administered to nations where face-to-face surveys are ...

Survey researchers increasingly recognize that a single survey of the general public can rarely represent the views of small groups of Americans. Such surveys frequently have too few interviews with ...