Dr Hyper Treated 20 Patients Using a New Therapeutic Procedure

Multiple Choice

Dr. Hyper treated 20 patients using a new therapeutic procedure. An outside observer rated the children's activity level on a laboratory task before and after the treatment; 80% of the children decreased their activity level following treatment, and Dr. Hyper concluded that the procedure was highly effective. What is the major problem with Dr. Hyper's experiment?

A) Lack of control group
B) Not double-blind
C) No baseline measure
D) The observer was biased