• 4.55 The following multiple regression model was developed to predict job performance as measured by a company job performance evaluation index based on a preemployment test score and college grade point average (GPA):

yn = 35 + 20x1 + 50x2 Where yn = job performance evaluation index x1 = preemployment test score x2 = college GPA

a) Forecast the job performance index for an applicant who had a 3.0 GPA and scored 80 on the preemployment test.

b) Forecast the job performance index for an applicant who had a 2.5 GPA and scored 70 on the preemployment test.