Population Samples: the Mean

In terms of the human population, we are unable to observe and chart the characteristics population as a whole.  When dealing with a population sample the mean is expressed as follows:

As you can see, the equations are nearly identical; in the case of sample populations, the Roman numeral Mu  is replaced with x-bar .

Case Example: Mean Height of UCLA Students

Nomenclature is also altered when discussing the sample Variance.