Purpose: to determine the regression equation; it is used to predict the value of the dependent variable (Y) based on the independent variable (X).
Procedure: select a sample from the population and list the paired data for each observation; draw a scatter diagram to give a visual portrayal of the relationship; determine the regression equation.
The regression line
A straight line that represents the relationship between two variables
Useful to add to the scatterplot to help us see the direction of the relationship
But it’s much more than this…
Prediction
Regression line enables us to predict Variable Y on the basis of Variable X
b
The slope of the regression line
The amount of change in Y associated with a one-unit change in X
a
The intercept
The point where the regression line crosses the Y axis
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