If All the Points in a Scatter Diagram Lie on the Least

Short Answer

If all the points in a scatter diagram lie on the least squares regression line, then the coefficient of correlation must be: $\begin{array}{|l|l|}\hline A&\text {1.0 }\\\hline B&\text { -1.0}\\\hline C&\text { either } 1.0 \text { or }-1.0\\\hline D&\text { 0.0 }\\\hline \end{array}$