Most athletes have some sort of "lucky" game behavior, like their lucky socks. They wore the socks one time when they played really well and so they associate them with doing well. However, they will disregard any of the times that they wore the socks and did not play well. This is an illusory correlation because the socks have nothing to do with actually doing well.
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the perception of a relationship between two variables that does not actually exist.
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.
the value of a number that dose NOT match the value of the other.