Is there a relationship between the raises administrators at State University receive and their performance on the job? A faculty group wants to determine whether job rating (x) is a useful linear predictor of raise (y). Consequently, the group considered the straight-line regression model
E(y) = β0 + β1x.

Using the method of least squares, the faculty group obtained the following prediction equation:
= 14,000 - 2,000x

Interpret the estimated slope of the line