Residual plot — Algebra I · Grade 9 or accelerated Grade 8, what it means and where it is taught
A plot of residuals against x, used to judge whether a line was the right model.
Taught in Algebra I · Grade 9 or accelerated Grade 8.
Where it is taught
What it rests on
Work through these first if this one does not settle.
- Residual — The gap between an actual value and the line's prediction.
Practise this idea
1 question in the course bank use Residual plot, in Bivariate Data & Correlation.
Problem 1
A residual plot shows a clear curved arch. This means
- a line is the wrong model
- the line fits perfectly
- r must be zero
- the data has no outliers
Worked answer
a line is the wrong model
Structure in the residuals means the model missed something
A curve needs a curved model