An in-depth study by Lewis and colleagues of 12 convicted murderers diagnosed with dissociative identity disorder looked into their backgrounds. The study found strong evidence that each was severely abused, both physically and sexually. Why does the text refer to this study as "flawed."
A) Malingerers were studied separately from the larger group of DID sufferers.
B) Malingerers were excluded from the study.
C) There was no control group of murderers without DID.
D) There was no control group of DID sufferers who were not murderers.

Question

Quizplus · Accepted Answer

The study was flawed because there was no control group of murderers without DID. This means that there was no way to compare the experiences of the murderers with DID to those without the disorder. As a result, it is difficult to know whether the severe abuse experienced by the murderers with DID was a cause or a consequence of their disorder.

An In-Depth Study by Lewis and Colleagues of 12 Convicted