If you have a curvilinear relationship, then:
A)It is not appropriate to use Pearson's correlation because it assumes a linear relationship between variables.
B)Pearson's correlation can be used in the same way as it is for linear relationships.
C)You can use Pearson's correlation; you just need to remember that a curve indicates that the variables are not linearly related.
D)Transforming the data won't help.

Question

Quizplus · Accepted Answer

Pearson's correlation assumes a linear relationship, so it is not appropriate for a curvilinear relationship. Other correlation measures, such as Spearman's rank correlation or Kendall's tau-b, may be more appropriate in this case.

If You Have a Curvilinear Relationship, Then