Dr. Maizenblu was testing out a new medication used to treat depression. He had 150 participants who had varying levels of depression. Because he wanted to see whether a new drug really worked, he separated the severely depressed from the mildly or moderately depressed. He then made sure the severely depressed group actually received the drug while the other group received the placebo. What error, if any, did Dr. Maizenblu make in this experiment?
A)He made no error at all.
B)He did not have enough participants in the study.
C)He showed selection bias.
D)He showed unethical treatment of depressed people.

Question

Quizplus · Accepted Answer

Because he did not use random assignment, his design has selection bias. As a result, there is no placebo control for the severely depressed patients and no experimental group for those less depressed, and therefore his study design is flawed.

Dr Maizenblu Was Testing Out a New Medication Used to Treat