Data analysis
Switch among a point cloud, one point's influence, and a sorted sample, and compare how the mean, an outlier, and the quartiles change the reading.
Regression and correlation
3 pieces about this concept, across works, topic guides, and exam visualizations.
Topics
Works
Scatter diagram, correlation, and the regression line
Drag points in a two-dimensional cloud and watch the direction, the correlation r, and the least-squares line change together.
An outlier's effect on the regression line
Keep the main cloud fixed and move one highlighted point to see how its horizontal distance and residual pull the least-squares line.