# Chapter 3 - Data Description - 3-1 Measures of Central Tendency - Exercises 3-1 - Page 125: 31

English letters are used to represent sample statistics. Greek letters are used to represent population parameters. sample mean $\bar{x}$, population mean $\mu$ sample variance $s^2$, population variance $\sigma^2$ sample standard deviation $s$, population standard deviation $\sigma$

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