Which of the following statements is true for the relationship between reliability and validity of a research tool ?

Which of the following statements is true for the relationship between reliability and validity of a research tool ?
1). A valid test may not be reliable.
2). A valid test must be reliable.
3). A reliable test is always valid.
4). A reliable test is never valid.
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Answers 2

2) A valid test must be reliable.

Explanation: 
  1. Reliability refers to the consistency of a research tool - if the test is repeated under the same conditions, it should produce similar results.
  2. Validity refers to whether the tool actually measures what it is intended to measure.
A valid test must be reliable because if a test is not consistent, it cannot be trusted to measure anything accurately. However, a reliable test may not always be valid - it can consistently produce the same incorrect results.
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A valid test must be reliable.

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