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What’s the main difference between population size and population variability?

Population size refers to volume while population variability refers to composition. For example, if we think about the population of citizens that live in New York City, population size would simply refer to the number of citizens that live in NY. 

However, if we think about population variability in NYC, we would look at the different characteristics of the citizens in NYC to see just how different everyone is. We might look at race/ethnicity, we might look at job sector, we might look at house household income. 

The idea is that if population variability is high, that means that the population is quite different. So for sampling purposes, it’s harder to sample a population with high population variability because the sample we test may not be representative of the overall population. 

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