Variation in the variable
The correlation coefficient (r) between two variables X and Y is -0.9. How much of the variation in the variable Y is explained by the variable X?
a. 90%
b. 81%
c. -0.81%
d. 0.9%
e. -81%
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It is only through the study of isolated and purified elements and their combination that one can observe characteristic properties and make cause and effect relationships.
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