Question

complete the statement.
when all the points fall on the regression line, the value of the correlation coefficient is

Explanation:

The correlation coefficient measures the strength and direction of a linear relationship between two variables. When all data points lie exactly on a regression line, the linear relationship is perfect. If the line has a positive slope, the coefficient is 1; if negative, it is -1. Thus, the value is either 1 or -1.

Answer:

1 or -1