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 ...

Companies and other organizations use marketing research to manage the risks associated with offering new products and services. These organizations don't want to spend too much money developing a ...

Consider the example in the section "Stratified Sampling". The study population is a junior high school with a total of 4,000 students in grades 7, 8, and 9. Researchers want to know how much these ...

Pew Research Center designed this study to assess the current state of online survey sampling methods – both probability-based and opt-in – and determine their accuracy on general population estimates ...

Ethics committees and funding agencies often receive protocols that involve either too many or too few animals to answer the specific research question being investigated. It is evident that a greater ...