A legal immigrant & former university-student masquerading as a lead quality-assurance technician.
"American Views: Trust, Media, & Democracy" (SUMMARY) from Knight Foundation:
Properly weighted surveys & polls accurately represent public opinion in the United States with participants ranging from 1,000 to 10,000 in number, generally; there exist exceptions (such as Pew Research Center's occasional 30,000-participant surveys), but a minimum of 1,000 participants exists as an industry-standard.