13) we say subjects are \blinded\ to the treatment when: the experimental group is unaware of what treatment…

13) we say subjects are \blinded\ to the treatment when: the experimental group is unaware of what treatment they are receiving the control group is unaware of what treatment they are receiving the researcher is unaware of what treatment the subjects are receiving both the experimental and control groups are unaware of what treatment they are receiving

13) we say subjects are \blinded\ to the treatment when: the experimental group is unaware of what treatment they are receiving the control group is unaware of what treatment they are receiving the researcher is unaware of what treatment the subjects are receiving both the experimental and control groups are unaware of what treatment they are receiving

Answer

Brief Explanations:

In an experiment, blinding occurs when the participants (both experimental and control groups) do not know which treatment they are getting. This helps reduce bias. The researcher being unaware is a different concept (double - blinding includes researcher unawareness too). Blinding is mainly about subject unawareness.

Answer:

Both the experimental and control groups are unaware of what treatment they are receiving