Discussion
Assertion (A) : Test retest is the method used to test the reliability of the measurement instrument.
Reason (R) : The measurement instrument to collect data should have both reliability & validity.
Codes :
Answer: C
Both statements are true, but the reason is not the correct explanation of the assertion. The test-retest method gives the same instrument to the same group twice and correlates the scores to judge reliability, which is the assertion.
The reason, that an instrument needs both reliability and validity, is also true, but it does not explain why the test-retest method is a measure of reliability. So the code of both true but not explaining is right.
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