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Statistics encompasses the methods of collecting, summarizing, analyzing, and drawing conclusions from data.

Biostatistics, in turn, is the application of statistics to biologi­cal, medical, and public health data.

In Medicine we are interested in preventing, diagnosing, and treating diseases in big Populations. But those Populations are too large to be studied in their entirety. For that reason, we obtain what we believe is a Representative Sample from that Population for our study.

A certain characteristic of a Population is known as a Parameter, whereas that characteristic in a Sample is known as a Variable.

Statistical Inference is the process of drawing conclusions about Parameters in a Population from the assessment of Variables in a Sample.