Researcher Zoe Zednick wanted to test the effectiveness of a new anger management treatment session ...

Researcher Zoe Zednick wanted to test the effectiveness of a new anger management treatment session at the Prairie County social work agency. She assembled 24 clients who had been referred for anger management and divided them randomly into two groups of 12. One group was assigned to the new anger management session while the other group went to a traditional anger management session. Each group was given an intake assessment that measured anger management skills. After clients finished the sessions, Zednick measured the level of anger management skills for all subjects in both groups. What experimental design did she use?
A) Classical experiment
B) One-shot case study
C) Time series
D) Static group comparison
E) One-group pretest-post-test