The personnel director for Electronics Associates developed the following estimated regression equation relating an employee's score on a job satisfaction test to his or her length of service and wage rate. 14.4 - 8.69"1 + 13.5X2 where Cl = length of service (years) To = wage rate (dollars) y job satisfaction test score (higher scores indicate greater job satisfaction) Round your answers to 2 decimal places. a. Interpret the coefficients in this estimated regression equation. If the wage rate does not change, a one year increase in length of service is associated with in job satisfaction score by b. Predict the job satisfaction test score for an employee who has four years of service and makes $6.50 per hour. units. If the length of service does not change, a dollar increase in wage results in in job satisfaction score by units.