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A parameter is a numerical characteristic of a population, such as a mean or standard deviation. It represents an entire group rather than a sample taken from it.
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Statistic: A numerical value that represents a characteristic of a sample, such as the sample mean or sample standard deviation.
Population: The entire group that is the subject of a statistical study, about which information is desired.
$\mu$ (Mu): $\mu$ represents the population mean, which is the average value of all observations in the population.