Which one of the following properties of a test would be taken as evidence of its validity.?
(a) Scores on the test correlated highly with scores on another test designed to measure the same ability
(b) Scores on a test at the beginning of a customer relations training programme predicted a supervisor's rating after one year on the job.
(c) Kilometres per litre of petrol used by a prototype test car varied over a series of standardized consumption tests by 10%