An investigator is testing a new assessment of anxiety, and to examine the efficacy of this new measure he gives the assessment twice to a group of participants at the beginning of the fall and spring semesters. He is testing for reliability.

test-retest

Explanation:

Test-retest reliability testing is repeating the test after using one measurement tool, in order to check if it is the best possible option.

The point is to see if the results are the same, so one can be sure that tools, methods, and measurements are the best possible, and that all the variables are the same, so they don't affect the validity of the research conclusion. .

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