Methods can matter: Where Web surveys produce different results than phone interviews

Over the past year, Pew Research Center conducted an experiment to see if the mode by which someone was surveyed – in this case, a telephone survey with an interviewer versus a self-administered survey on the Web – would have any effect on the answers people gave. We used two randomly selected groups from our American Trends Panel to do this, asking both groups the same set of 60 questions. …

Here are three of the areas that showed the biggest mode gaps in responses from the phone and Web groups in our study: CONT.

Scott Keeter, Pew

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