If the points of a scatterplot lie on a straight line, then the correlation:
A) must be 1.
B) must be positive.
C) must be 0.
D) must be either 1 or −1.

Question

Quizplus · Accepted Answer

If the points of a scatterplot lie on a straight line, then it indicates a perfect linear relationship between the two variables. In this case, the correlation coefficient will be either 1 or −1 depending on whether the slope of the line is positive or negative. Hence, the best choice is D - the correlation must be either 1 or −1.

If the Points of a Scatterplot Lie on a Straight