Suppose You Determine the Estimated Sample Regression Function to Be $\hat { y } _ { i } = 687.51 - 3,212.97 \cdot x _ { i } .$

Suppose you determine the estimated sample regression function to be $\hat { y } _ { i } = 687.51 - 3,212.97 \cdot x _ { i } .$
You would conclude that

A) y_i is estimated to increase by 687.51 for every one unit increase in x_i.
B) y_i is estimated to increase by 3,212.97 for every one unit increase in x_i.
C) y_i is estimated to decrease by 3,212.97 for every one unit increase in x_i.
D) $\hat { y } _ { i }$ is estimated to equal 3,212.97 when x_i = 0.