Wondering how many people in the United States have a smartphone? If you poll 20 people on the street, your survey won’t be representative of the entire American population. But if you just want to ...

Survey questions raising concerns in middle schools: *The last time you engaged in sexual activity, did you use one of the following to protect yourself from sexually transmitted diseases (STDs)?

Pew Research Center’s American Trends Panel (ATP) is now the Center’s principal source of data for U.S. public opinion research. This nationally representative survey panel will turn 5 early this year ...