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1. Bivariate statistical techniques allow the joint analysis of two characteristics of the individuals of a population with the purpose of detecting possible relationships between them.

   • Regression: The term regression was originally used by Galton to indicate certain relationships in the theory of biological inheritance, although it has subsequently come to mean the statistical method developed to investigate such relationships.
   • Regression analysis gives rise to a mathematical equation that allows us to describe the relationship between two variables. That is, to obtain an "ideal" line known as a regression line, which describes the relationship or dependence between two variables.