A psychologist discovers that the blood of patients with schizophrenia contains a certain chemical not found in the general population.This means that

Question

Quizplus · Accepted Answer

The presence of the chemical in the blood of patients with schizophrenia indicates a relationship, but it does not prove causation. It could be that having schizophrenia causes the chemical to form, or that there is a third factor that causes both schizophrenia and the presence of the chemical. Therefore, the best choice is D, which acknowledges the relationship without making a definitive causal claim.

A Psychologist Discovers That the Blood of Patients with Schizophrenia