The correct answer would be, Test-Retest Method.
Tara wanted to assess the reliability of her measure of happiness so she had a group of introductory psychology students complete the measure of happiness two time and then compared the scores, calculating a correlation coefficient. Tara used the method of Test-Retest to assess the reliability.
Explanation:
Reliability is the measure to check if the thing or person is trustworthy, or the person or thing works consistently well over and over again.
Test-Retest method is a method to measure this reliability or consistency of things. Test-Retest method is actually a method in which the same test is taken again but at some other time to check if it generates or gives the same results repeatedly.
So when Tara asked the students to complete the measure of happiness two times and then compared the scores and calculated a correlation coefficient, she actually used the Test-Retest method to check the reliability of her measure of happiness.
Learn more about Test-Retest Method at:
https://brainly.com/question/14041155
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