**s (or sd):** The sample standard deviation is a point estimate for the population standard deviation / the dispersion statistic for samples

**µ:** the central tendency statistic for populations

**XBar:** a point estimate for the population mean

**σ:** the actual population standard deviation / symbol for the measurement of dispersion in a population

**N** is for populations

**n:** The statistic for number of data in a sample

**x: ** the individual value

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