Fit a linear function to data when a scatter plot suggests a linear association.
Decide whether a scatter plot suggests a linear association
Problem
Does this scatter-plot description suggest a linear association: points fall close to an upward sloping straight band?
Big Picture
What this problem is really about
A scatter plot can have an overall direction without having a linear form. Look past small point-to-point variation and ask whether a single straight band would capture the cloud without systematic bending; then use the band’s tilt to describe the sign of any linear association.
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