Least-squares regression equations

Once we see a linear pattern in a scatterplot, we fit a line to model the relationship and make predictions. But how do we know what line fits the data "best?" To solve this problem, we'll learn about residuals and least-squares regression .

Introduction to residuals and least squares regression

Calculating residual example

Calculating and interpreting residuals

Calculating the equation of a regression line

Calculating the equation of the least-squares line

Interpreting slope of regression line

Interpreting y-intercept in regression model

Interpreting a trend line

Interpreting slope and y-intercept for linear models