$\begingroup$ @Michael, I don't know which question you were reading but the OP asked how to test for an association, not for a measure of association. In any case, as nice as your answer may be, (and ignoring the fact that it requires

Practice: Positive and negative linear associations from scatter plots. Practice: Describing trends in scatter plots. Positive and negative associations in scatterplots. This is the currently

Classifying Linear & Nonlinear Relationships from Scatter Plots

nals complete negative association and +1 complete positive linear association. If there is no linear relationship between the variables, then the correlation coe±cient is 0. There may

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So, there is a negative association. Because the data points do not lie along a line, the association is non-linear. Example 5 : A survey made among students in a district and the scatter plot shows the level of reading and height for 16