Interactive applet
Scatter Plots and Best Fit
Add points, then fit a line. Interpret slope in context and watch residuals.
Hands-on lab
Drag points · tap empty grid to add
Least-squares line
ŷ = 0.63x + 0.66
Slope 0.63: each additional 1 unit of x is associated with about 0.63 units of y.
Missions
- Create a negative association
- Add at least 7 points
0/2 complete
Guided questions
Create a strong positive association. Where does your line sit?
Reflection
Why can a line be a useful model even when no point sits exactly on it?
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