Question

what is the purpose of a regression line?
o to connect all the points in a scatterplot
o to show the general tendency of the points in a scatterplot
o to provide a scale for the x - coordinates of the points in a scatterplot
o to provide a scale for the y - coordinates of the points in a scatterplot

Explanation:

A regression line is a line that best fits the data points in a scatter - plot. It does not connect all the points (as there is always some error in real - world data). It is not used to provide a scale for \(x\) or \(y\) coordinates. Its main purpose is to show the general relationship or tendency (such as positive or negative correlation) among the data points in a scatter - plot.

Answer:

to show the general tendency of the points in a scatterplot