In order to predict y-values using the equation of a regression line, what must be true about the correlation coefficient of the variables?

Question

A. The correlation between variables must be an x-value of a point on the graph.

B. The correlation between variables must be significant.

C. The correlation between variables must be a y-value of a point on the graph.

D. The correlation between variables must be greater than zero.

Answer 1

So, what does the correlation coefficient tell you about the accuracy of the regression line?

Answer 2

Well we only use the regression line for predictions if the regression is a reasonable fit for the data, the correlation coefficient is significant, and the data for the predicted values do not go beyond the scope of the data used to estimate the regression.

B

Answer 3

I agree