Correlation and lines of best fit
Pages
Describing correlation
Positive, negative or no correlation, strong or weak, read from the points.
The line of best fit
A straight line by eye through the points, never forced through the origin.
Estimating with a line of best fit
Reading an estimate off the line inside the data range, and its reliability.
The danger of extrapolation
Why extending the line beyond the plotted data gives unsupported estimates.
Correlation is not causation
Why two quantities can rise together without one causing the other.
Practice
Practice
Describing correlation
Positive, negative or no correlation, strong or weak, read from the points.
PracticeThe line of best fit
A straight line by eye through the points, never forced through the origin.
PracticeEstimating with a line of best fit
Reading an estimate off the line inside the data range, and its reliability.
PracticeThe danger of extrapolation
Why extending the line beyond the plotted data gives unsupported estimates.
PracticeScatter graphs review
Correlation and lines of best fit.