Question

a close friend has joined a clinical trial. when you ask her about the types of treatment she might be given, she tells you that neither she nor the doctor running the trial will know until the process has been completed. what type of trial has she joined? theoretical peer reviewed epidemiological double - blind unsafe

Explanation:

In a double - blind trial, neither the participants nor the researchers know who is receiving which treatment until the trial is over. This helps eliminate bias. The other options do not match this description. Theoretical trials are more about models and concepts, peer - reviewed refers to a process of evaluation, epidemiological trials focus on population health patterns, and unsafe is not a type of trial design in this context.

Answer:

double - blind