Suppose that there are 23 black marbles and 31 white marbles in an urn. One marble is selected at random. What is the probability that it is black

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