What does it mean that "reliability is necessary but not sufficient for validity"?
A)If a measure is reliable, it is also valid.
B)If a measure is valid, it is also reliable.
C)Reliability and validity are unrelated concepts.
D)Reliability and validity are the same concept.

Question

Quizplus · Accepted Answer

For a measure to be valid (i.e., it accurately measures what it is supposed to measure), it must first be reliable (i.e., it produces consistent results under consistent conditions). However, a measure can be reliable without being valid. For example, a broken scale that consistently gives the same wrong weight is reliable but not valid.

What Does It Mean That "Reliability Is Necessary but Not