Population Samples: The Variance


  There is one notable change in the equation for the variance: one is subtracted from the sample size n in the denominator.  The Standard Deviation of the sample is the square root of the sample variance and is represented by s.


Case Example: The s2 of our Stanford population

What is the Variance and Standard Deviation of our Sample?

The Variance (s2) is 17.13;  the Standard Deviation (s) is 4.1

A 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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