If the correlation r=0r = 0r=0, what does this imply about the regression line y^=β0+β1x\hat{y} = \beta_0 + \beta_1 xy^=β0+β1x?
The slope β1\beta_1β1 must be 000.
The intercept β0\beta_0β0 must be 000.
The model is perfect.
The slope is undefined.