the value of a number that dose NOT match the value of the other.
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A degree of correspondence or comparison between two math values.
Z Test
NO. correlation just (implies) a relationship ... for example, both may be caused by the same thing.
An undefined correlation is one in which the data would not plot with points making a vertical line.
There would be a negative correlation in the classroom, of a student's grades, with the number of days absent from class.