What are the primary statistics used to study population change and what is the purpose of each?

The primary statistics used for studying population change include: Population size which refers to the number of people in a specific population. An 'increase or decrease' in the population size helps to know about the 'actual number' of people. Mortality or 'Death rate' is the number of individual deaths in a population contributing to a decrease in population. Birthrate or Fecundity is the 'number of births per unit' of time leading to an increase in the population.

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