A music teacher wants to test her students on their piano skills. She then proceeds to administer a multiple-choice test. This test lacks

If a test measures what it is supposed to measure, that test has

Annika took a personality test in April. She took the same test in June and got a very similar score. This personality test would be estimated to be

A music teacher wants to test her students on their piano skills. She then proceeds to administer a multiple-choice test. This test lacks