What is meant by reliability and validity? Can a scale be reliable if it is not valid? Can it be valid if it is not reliable? Explain.
What will be an ideal response?
Ans: Reliability refers to the consistency of a scale. Validity refers to its accuracy. A scale can be reliable even if it is not valid. This means it is consistently inaccurate, which is a possibility. However, it is not possible for a tool to be valid if it is not reliable because it cannot be accurate if it is inconsistent.
Learning Objective: 13.2: Describe the mechanisms for achieving measurement accuracy, with a focus on reducing measurement error by certain tests of the reliability and validity of measurement tools.
Cognitive Domain: Comprehension
Answer Location: Measurement Error
Difficulty Level: Medium
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