Correlation measures linear association. If the relationship between an explanatory variable ?X and a response ?Y is positive and increasing but has some curvature, as shown by a trend line through the scatter, the correlation will be: 00 . There is not enough information to determine the effect. 0< correlation <10< correlation <1 . –1< correlation <0–1< correlation <0 .

Question

Correlation measures linear association. If the relationship between an explanatory variable ?X and a response ?Y is positive and increasing but has some curvature, as shown by a trend line through the scatter, the correlation will be:

00 .
There is not enough information to determine the effect.
0< correlation <10< correlation <1 .
–1< correlation <0–1< correlation <0 .

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