Correlation and regression
Drag any point to reshape the data
Drag the dots
The regression line always passes through the mean point (x̄, ȳ). Drag the data and this remains true.
Tip: try moving just one point far away
Try a pattern
Strength is not steepness
A steep line is not automatically a strong correlation. The value of |r| depends on how closely the points follow a straight-line pattern.
The mean point stays on the line
The highlighted point is (x̄, ȳ). Move the data and observe that the regression line continues to pass through it.