Online surveys remain one of the easiest ways to earn a little extra money or gift cards from your phone. While many peo ...

To better understand the current landscape of commercially available online nonprobability samples, Pew Research Center conducted a study in which an identical questionnaire was administered to nine ...

Anyone who has taken a survey has likely been given the option to “check all that apply” when answering a question. The instruction is widely used in data collection because of its ease and efficiency ...