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2. Huffington Post / YouGov Public Opinion Polls

   data.huffingtonpost.com/yougov/methodology

   Each survey consists of approximately 1,000 completed interviews among U.S. adults using a sample selected from YouGov’s opt-in online panel of all 50 states plus the District of Columbia to match the demographics and other characteristics of the adult U.S. population.

3. Survey (human research) - Wikipedia

   en.wikipedia.org/wiki/Survey_(human_research)

   A good sample selection is key as it allows one to generalize the findings from the sample to the population, which is the whole purpose of survey research. In addition to this, it is important to ensure that survey questions are not biased such as using suggestive words. This prevents inaccurate results in a survey.

4. Survey sampling - Wikipedia

   en.wikipedia.org/wiki/Survey_sampling

   In a probability sample (also called "scientific" or "random" sample) each member of the target population has a known and non-zero probability of inclusion in the sample. [7] A survey based on a probability sample can in theory produce statistical measurements of the target population that are unbiased, because the expected value of the sample ...

5. Current Population Survey - Wikipedia

   en.wikipedia.org/wiki/Current_Population_Survey

   The survey asks about the employment status of each member of the household 15 years of age or older as of a particular calendar week. [4] Based on responses to questions on work and job search activities, each person 16 years and over in a sample household is classified as employed, unemployed, or not in the labor force.

6. Sampling (statistics) - Wikipedia

   en.wikipedia.org/wiki/Sampling_(statistics)

   In statistics, quality assurance, and survey methodology, sampling is the selection of a subset or a statistical sample (termed sample for short) of individuals from within a statistical population to estimate characteristics of the whole population. The subset is meant to reflect the whole population and statisticians attempt to collect ...

7. Opinion poll - Wikipedia

   en.wikipedia.org/wiki/Opinion_poll

   An opinion poll, often simply referred to as a survey or a poll (although strictly a poll is an actual election), is a human research survey of public opinion from a particular sample. Opinion polls are usually designed to represent the opinions of a population by conducting a series of questions and then extrapolating generalities in ratio or ...