The CEO of Gustav Co reported the results of a regression analysis designed to predict the sales generated by a sales representative. The independent variable he used is the number of hours worked by each representative. The results are provided below.

Y = -3,200 + 5,000X, two-tail p value = 0.025 (for testing b1)

Interpret the estimate of b0 , the Y-intercept of the line.

There is enough evidence at the 5% level to conclude that hours worked is a useful linear predictor of sales?