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 ...

Probability-based panel: This refers to a national survey panel recruited using random sampling from a database that includes most people in the population. Today, most such panels in the United ...

Black Americans constitute a population that is multicultural, regionally distinctive and often underrepresented in surveys. While most national public opinion surveys allow researchers to study ...