How many U.S. adults use the internet? There are a lot of sources with answers to this question. Yet these different sources can be tricky to reconcile.
when designing an online survey questionnaire, there is more than one way to ask a respondent to select which options in a series applies to them.
A growing share of polling is conducted with online opt-in, or nonprobability, samples. This trend has raised some concern within the industry because, while low participation rates pose a challenge for all surveys, the online opt-in variety face additional hurdles.