ANSWER:
The study is called Single-blind experiment when the subjects do not know "who is in the experimental group" and "who is in the control group", but the experimenters do know.
Step-by-step explanation:
- Single-blind is an experiment that is conducted by a researcher who has information about who the participants are and to which groups they belong.
- However, the participants are not aware of the details of the experiment.
- The single blind experiments can be biased because researcher has all the necessary information.
- On the other hand, the double blind experiments are the ones in which neither the researcher nor the participants have the necessary information related to the experiment.
- Therefore, double blind experiments are considered to be non-biased.
- In single blind experiments, the researcher who has information related to the experiment can manipulate and make changes to the variables to get the desired results from the experiment.