The key to establishing a nonmonotonic relationship between two variables is determining if one is present (or absent)when the other is present (or absent).

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This is true. A nonmonotonic relationship means that the relationship between two variables goes up and down, instead of just increasing or decreasing in a straight line. In order to establish this type of relationship, it is important to observe the presence or absence of one variable when the other is present or absent.

The Key to Establishing a Nonmonotonic Relationship Between Two Variables