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(sampling)= | ||
# Sampling | ||
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```{admonition} Important Readings | ||
:class: seealso | ||
- {cite}`freedman2007statistics`, Chapter 19, 20 | ||
``` | ||
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## Sample Surveys | ||
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Researchers are often interested in **populations**. This is the group of individuals to which the research aims to generalize. The numerical facts of interest are called **parameters**. Maybe you want to know the average lifespan of owls. The parameter of interest is the average lifespan. The population of interest is all owls. | ||
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Of course, the leading owl experts don't study every single owl. Nearly all researchers work with **samples**, or some subset of the larger population. One could estimate the average lifespan of owls from a sample, but this wouldn't be a parameter. We reserve parameter as a term for populations. Instead the sample average is a **statistic** meant to estimate the population parameter. | ||
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