She has a broad range of experience in research and writing ... methods to ensure that the sample resembles the known features of the population. For example, if the subject population is 55% ...

Consider the example in the section "Stratified Sampling". The study population is a junior high school with a ... The example in the section "Stratified Sampling" assumes that the sample of students ...

When selected this way, the sample on average will look just like the full population in terms of the share that ... chance of being selected than everybody else. A good example is a Pew Research ...

A few examples: For reference, population of Great Britain is ~60 million and of USA is ~300 million. The sample sizes in these studies work out to 0.0033 to 0.00066 percent of the respective ...