A questionnaire gives nearly the same blood pressure self-care score when completed twice by the same stable patients one week apart. This finding mainly demonstrates which property?

Correct answer: B. Reliability

  • A. Internal validity
  • B. Reliability
  • C. External validity
  • D. Sampling adequacy

Explanation

Reliability means that a measurement gives consistent results under similar conditions. Validity concerns whether the instrument measures what it is intended to measure, so consistency alone does not prove validity.

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