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Inferential statistics, is used to make claims about the populations that give rise to the data we collect. This requires that we go beyond the data available to us. Consequently, the claims we make about populations are always subject to error; hence the term "inferential statistics" and not deductive statistics.
Population dynamics is considered a form of demography. Demography is the study of statistics of human populations. Population dynamics focuses on how those populations change over time, specifically.
In statistics the parameters of the distributions of populations are the fundamental values of interest. In a way the randomness just gets in the way of learning about the parameters. They are considered constant because they define or characterise the distributions of populations.
Common applications of algebra in biology include growth rates of populations and any general statistics about survival, reproduction, etc
Business can randomly sample a group of people in the populations. They can also call for volunteers such as setting up a focus group.