Apsychologist develops a measure of self-esteem to study the difference between participants who score low and those who score high on this variable of self-esteem. he does this to devise an accurate method for studying this variable. in this scenario, the psychologist is trying to establish

"construct validity"

Explanation:

According to my research on studies made by different Psychologists on self esteem, I can say that the term that is being described in the question is called "construct validity". This is defined as "the degree to which a test measures what it claims, or purports, to be measuring." Construct Validity one of three verification evidences used in many psychological studies. The other two are content validity and criterion validity.

Construct validity is "the degree to which a test measures what it claims, or purports, to be measuring." In the classical model of test validity, construct validity is one of three main types of validity evidence, alongside content validity and criterion validity

aa

explanation:

literally the answer is aa. not kidding. aa is a group.