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A Cohen's d value of .25 may be considered to be a large effect.
World's Population
The total number of people living on Earth at any given time, an ever-changing figure due to births, deaths, and migration.
Living Standards
The measure of financial wealth, comfortability, possessions in terms of goods, and necessary items afforded to a distinct social class or area.
Birthrates
The number of live births per thousand of the population in a given period, used as an indicator of population growth.
Present Value
The current value of a future sum of money or stream of cash flows, given a specified rate of return.
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