The strong correlation between test results and job performance has led to numerous expert recommendations that tests be used as the only selection tool in the hiring process.
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To use predictive validation, one administers the test to applicants before they are hired. The applicants are then hired using existing selection techniques but not the new tests in development. Later, job performance measures are compared to the test scores under development.
Concurrent validation is the most dependable way to validate a selection test.
Content validity is based on showing that the scores on the test are related to job performance.
Equivalent form estimates compare test scores from the same test administered at two points in time to determine test equivalence.