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A new academic achievement test assesses elementary-age students’ math ability. The test developers found, however, that students in the research group who took the test two times had scores that were quite different upon the second test administration, which was conducted two weeks after the initial administration. It was determined that the test did not have acceptable ________.

Answer :

Answer:

Test-ReTest Reliability.

Explanation:

'Test-ReTest Reliability' is illustrated as the process that primarily intends to examine the stability or consistency of the outcome of a test result over a period of time. So, we can say that this process chiefly intends to test the reliability and validity of the results of the test is conducted after a period of time.

As per the given description, the test didn't possess acceptable 'test-retest reliability' as the outcomes do not contain consistency or regularity(as reflected by the 'two different scores in the assessment of math ability of students, conducted two weeks prior and after the initial administration'). Thus, the test could not be considered reliable or stable as the results vary with time.

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