I need this answer

Dear Student,
a) non-linear correlation - curvilinear correlation
b) partial correlation - relationship between more than 2 variables, keeping one variable constant
c) perfect correlation - two variable move in reverse direction but variation always positive
d) positive correlation - most of the points lie in the first and third quadrants.
Note- In place of 'a. linear correlation' it should be 'a. non linear correlation' because the other name of non linear correlation is curvilinear correlation.

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