The ratio of burgers to shakes served at the diner is 4: 1. last week, the diner served 20 shakes. how many burgers did the diner serve?

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