Question

A researcher investigating the association between two variables collected some data and was surprised when he calculated the correlation. He had expe

Scatterplots
ANSWERED
asked 2020-12-15
A researcher investigating the association between two variables collected some data and was surprised when he calculated the correlation.
He had expected to find a fairly strong association, yet the correlation was near 0.
Discouraged, he didn't bother making a scatterplot.
Explain to him how the scatterplot could still reveal the strong association he anticipated.

Answers (1)

2020-12-16
The correlation coefficient only measures for a linear association. If the correlation is, for example, a very strong quadratic association, then the correlation coefficient will give a value close to zero, even if there is a very strong association.Association could be nonlinear
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