A psychologist discovers that the blood of patients with schizophrenia contains a certain chemical not found in the general poputlation.This means that
A) this chemical causes a person to develop schizophrenia.
B) having schizophrenia causes this chemical to form in a person's blood.
C) both schizophrenia and the chemical are caused by some unknown third factor, such as
The typical diet in mental hospitals.
D) the chemical and schizophrenia are related, but no causal relationship has been
Established.

Question

Quizplus · Accepted Answer

The discovery of a chemical in the blood of patients with schizophrenia does not necessarily mean that it causes the development of the disorder or that the disorder causes its formation. It simply suggests a relationship between the two factors, but more research is needed to determine the nature of this relationship. Thus, the best answer is D, which states that no causal relationship has been established yet.

A Psychologist Discovers That the Blood of Patients with Schizophrenia