What is the measure of ∠ABD? What is the reason? 48° , isosceles triangle theorem 60° , isosceles triangle theorem 60° , equilateral triangle theorem 48° , equilateral triangle theorem

Kilgore trout creates a new scale to diagnose depression. however, his scale only assesses one symptom of depression while ignoring others. which of the following is his new scale most likely lacking? a) test-retest reliability b) discriminant validity c) criterion validity d) alternate-forms reliability e) content validity f) none of the above