In a research context, a valid test means a test that measures only what it is intended to measure. This means that results of the test are not affected by any additional factors.
For example: A test that is designed to assess students' mathematical abilities should test only mathematical knowledge and skills. If the test also examines the students' ability to read math problems, then this test will not be a valid and accurate measure of students' mathematical ability.
Read this paragraph and answer the question below.
Are Polygraphs Valid Tests?
Many people question the validity of polygraphs or 'lie detector tests'. These tests are used to check if someone is lying or telling the truth. Polygraphs measure 4 physiological reactions of a person when he or she answers questions: heart rate, blood pressure, breathing, and skin reactions. The problem is that there is no evidence that any one pattern of physiological reactions proves that a person is lying or telling the truth. An honest person may be nervous when answering truthfully and a dishonest person may not be anxious at all.
That is why courts do not consider results of polygraphs as valid evidence.
Why do people question the validity of polygraph tests? Choose ONE correct answer.
