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Research instruments are tools used to collect data in a study, such as questionnaires, tests, interview schedules, observation checklists, and rating scales. The quality of data obtained from these instruments depends largely on their reliability and validity. Reliability refers to the consistency and stability of the instrument, whereas validity refers to the extent to which the instrument measures what it is intended to measure. Assessing both reliability and validity is essential to ensure accurate findings and meaningful interpretations. Reliability is assessed through several methods. One of the most common methods is the test-retest reliability method. In this approach, the same instrument is administered to the same group of respondents on two different occasions. The scores obtained are then correlated. A high ________ ________ ______ ______ _____ ______.
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