Chapter 2: Simple Regression

Regression analysis is an invaluable statistical breakthrough and allows predictions to be made about unknown future events from known findings. Regression develops a prediction equation by using the relationship between variables and the linear line concept. When the scores of one variable are known after the relationship between the variables is determined, the score of the other variable can be estimated.

Using the values of one variable, can other variable values be predicted? The number of cigarette packs smoked in a year may be desired to be used in the estimation of those with lung cancer. In this case, regression analysis can be done when it is desired to investigate how the change in the explanatory variables causes a change in the explained variable.