Biostatistics, also called biometry, is the study of how to apply statistical principles to a variety of biological fields. It includes everything from planning experiments to analyzing data to interpreting findings in the biological sciences. Possible applications include estimating the magnitude of these problems over time and characterizing a population (such as adults in Boston or all children in the United States) in terms of the percentage of subjects who are overweight or have asthma. Analysis of representative samples is the more practical method. Biostatistics is a field that focuses on the collection, organization, and interpretation of data. Good population estimates can be obtained from sample data if the samples are statistically and demographically representative of the target population. Thus, in biostatistics, one performs analyses on samples to conclude the population as a whole. Definitions and central concepts in biostatistics are presented in this unit.

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