The textbook indicates that validity is the second criterion used to determine the usefulness of a diagnostic system. This is because
A) as long as a diagnostic system is reliable, it does not matter if it is valid.
B) if you don't have reliability, you cannot have validity.
C) reliability and validity are independent of one another.
D) a diagnostic tool that is reliable is also likely to have at least moderate validity.
E) validity is usually more important than reliability.

Question

Quizplus · Accepted Answer

Validity refers to how well a test measures what it is supposed to measure, while reliability refers to the consistency of the test results. If a test is not reliable (i.e., does not produce consistent results), it cannot be valid because inconsistent results cannot accurately measure the intended attribute. Therefore, reliability is a prerequisite for validity.

The Textbook Indicates That Validity Is the Second Criterion Used