What is a key feature of a double-blind experiment

• A. The researcher knows which group the participant is in, but the participant does not know.
• B. The participant knows which group they are in, but the researcher does not know.
• C. Neither the researcher nor the participant knows which group the participant is in.
• D. Both the researcher and the participant know which group the participant is in.

Answer: (C)

Verified step by step guidance

1. Understand the concept of a double-blind experiment: It is a study design used to prevent bias in research results.
2. Recognize that in a double-blind experiment, neither the participants nor the researchers know who is receiving a particular treatment.
3. Identify the purpose of this design: It helps to eliminate bias from both the participants and the researchers, ensuring that the results are not influenced by expectations.
4. Compare the given options to the definition of a double-blind experiment.
5. Select the option that aligns with the definition: 'Neither the researcher nor the participant knows which group the participant is in.'