In Developing an Instrument to Measure Self-Esteem,the Researcher Administered the Instrument

In developing an instrument to measure self-esteem,the researcher administered the instrument to a group of individuals who were substance abusers and to a group who were not drug users,expecting to see significant differences in scores between the two groups.How should this method of establishing construct validity be categorized?

A) Factor analysis
B) Convergent validity
C) Discriminant validity
D) Contrasted-groups approach

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