If all the points in a scatterplot lie on the least squares regression line, then the correlation coefficient r must be:
A) 1.0
B) -1.0
C) either 1.0 or -1.0
D) 100
E) 10

Question

Quizplus · Accepted Answer

If all the points in a scatterplot lie on the least squares regression line, it means there is a perfect linear relationship between the two variables, which indicates a correlation coefficient of either 1.0 or -1.0. Therefore, the correct choice is C.

If All the Points in a Scatterplot Lie on the Least