help me please

UESTION 1 3 point A staffing professional must choose 1 of 3 options to include in a company's selection procedure. The professional decides to use a concept learned in their undergraduate staffing class at a Massachusetts university - the utility calculation known as the Brogden-Chronbach-Gleser formula. The company wants to hire 10 of the 100 applicants. The job pays $30,000. The average employee in this job remains in the job for 3 years. Option 1 is a mental ability test. This test has a validity of 0.51 and the average standard test score of those selected in 1.00 This test cost $20 per administration.. What is the expected S payoff due to increased productivity for all employees hired if Option 1 is used QUESTION 2 3 points (Ex Option 2 is also a mental ability test. The professional want to compare this to the other mental ability test given it's plus (higher validity) and drawback (higher cost) This test has a validity of 0.6 and the average standard test score of those selected in 1.00. This test cost $30 per administration What is the expected payoff due to increased productivity for all employees hired if Option 2 is used? QUESTION 3 3 pc Option #3 is to simply use a "tried and true" technique of checking references. The validity of reference checks is 0.26, but the cost of calling each applicants' references is estimated at $15. The average standard "test" score for those selected is 1.0 What is the expected payoff due to increased productive for all employees hired if the company uses reference checks as pa of the selection procedure.? QUESTION 4 3 point Which of the 3 options of selection measures should the HR professional recommend? a Option 1 - Mental Ability Test (A) b. Option 2 - Mental Ability test (B) c. Option 3 - Reference check d. None of the above