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There would be a negative correlation in the classroom, of a student's grades, with the number of days absent from class.
Positive correlation = the slope of the scattered dots will rise from left to right (positive slope) Negative correlation = the slope of the scattered dots will fall from left to right (negative slope) No correlation = no real visible slope, the dots are too scattered to tell.
A negative number times a negative number gives you a POSITIVE number, not a negative number.
there is no real life situation
The square roots of negative numbers.