## Population Samples: The Variance

## There is one notable change in the equation for the variance: one is subtracted from the sample size

nin the denominator. The Standard Deviation of the sample is the square root of the sample variance and is represented by s.

## Case Example: The s

^{2}of our Stanford population

## What is the Variance and Standard Deviation of our Sample?

## The Variance (s

^{2}) is 17.13; the Standard Deviation (s) is 4.1A descriptive statistic particular to population samples is the Standard Error of the Mean, a term you will become more familiar with when discussing the Central Limit Theorem.

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