Linear association — Grade 8 Math, what it means and where it is taught
The dots roughly follow a straight line.
Taught in Grade 8 Math.
Where it is taught
Practise this idea
2 questions in the course bank use Linear association, in Scatter Plots & Association.
Problem 1
Two variables have a perfect V-shaped relationship. Is the linear association strong or weak?
Worked answer
weak
One arm rises, the other falls
The rises and falls cancel
So the linear association is weak, even though the pattern is perfect
Problem 2
A plot of hours of television against grade shows a moderate negative linear association with two outliers. Write one sentence a statistician would accept about cause.
Worked answer
no cause can be concluded from this association
The data shows an association only
A third factor could drive both
So no causal claim is justified