Final answer:
The manager should be primarily concerned with the validity of the test to predict the applicant's performance on the job.
Step-by-step explanation:
A manager attempting to select a test for a job applicant that will be a good predictor of the applicant's performance on the job should be primarily concerned with the validity of the test.
Validity refers to the extent to which a test accurately measures what it is intended to measure. In this case, the manager wants a test that can predict the applicant's performance on the job. A test with high validity will accurately assess the applicant's knowledge, skills, and abilities (KSAs) that are important for the job, and can therefore predict their job performance.
It is important for the manager to use a test that has been verified to correlate with good job performance. This means that the test should have been thoroughly researched and validated to ensure that the scores on the test align with actual job performance. By using a valid test, the manager can make more informed decisions about selecting the best candidate for the job.