An undefined correlation is one in which the data would not plot with points making a vertical line.
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the age of adults and the amount of sleep they get (:
Line
Undefined means that it is not possible to determine the answer of the question. For example: 18/0 - you can not divide anything by zero (0). Therefore the answer of this question is Undefined of Undefinable.
NO. correlation just (implies) a relationship ... for example, both may be caused by the same thing.
In Euclidean geometry point, line and plane are not defined.