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The term for the people who are interviewed in a research study is "participants" or "respondents." They provide valuable information and data to the researchers to help answer the study's research questions.
Demography is the statistical study of human populations The focus in demography is on a population. while The term demographics refers to characteristics of a population such as total fertility rate, or political theories
Demography
Apiology is the term used for people who study bees.
The term population distribution refers to how the population numbers fluctuate in different areas of the world. An example would be the people living in Iowa compared to the number of people living in California.
The current world population is 7.9 billion as of March 2022 according to the most recent United Nations estimates elaborated by Worldometer. The term "World Population" refers to the human population (the total number of humans currently living) of the world.
population density
Ergonomics
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Population, in statistics, is the entirety of units for which some variable information is collected for statistical purposes. "Population" need not have anything to do with people. For example, in a forestry study the population might be all trees in a given area, and the measured variable could be the species and/or ages of a selection (sample) of the population.