Which of the following is true about the relationship between reliability and validity?
a. As reliability increases, validity decreases.
b. If a measure is reliable, it will be valid.
c. There is no relationship between these two concepts.
d. Unless a measure is reliable, it cannot be valid.
ANS: D
Validity cannot be considered apart from reliability. If a measurement method does not have acceptable reliability (e.g., dependability, consistency, and accuracy), validity is a moot issue.
The concepts of reliability and validity go hand in hand. Validity cannot be considered apart from reliability. If a measurement method does not have acceptable reliability (e.g., dependability, consistency, and accuracy), validity is a moot issue.
A measure can be reliable, but not valid. Example: a blood pressure cuff can consistently (reliability) measure 10 mm Hg too high (not valid).
The concepts of reliability and validity go hand in hand. Validity cannot be considered apart from reliability. If a measurement method does not have acceptable reliability (e.g., dependability, consistency, and accuracy), validity is a moot issue.
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