Given the model y^=15−0.5x\hat{y} = 15 - 0.5xy^=15−0.5x, which of the following is true?
The correlation rrr is positive.
The line slopes upward.
For every 111-unit increase in xxx, yyy is predicted to decrease by 0.50.50.5 units.
The yyy-intercept is −0.5-0.5−0.5.