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A single-blind study is an experimental setup where the participants are unaware of their condition assignment, but the experimenter administering the procedure knows the groups. While this design controls for participant expectations, it fails to protect against experimenter expectancy effects, making it more susceptible to researcher bias than a double-blind study.

Single-Blind Study

This type of experiment is commonly used in nutritional studies. Participants are given either a dietary supplement or placebo, so that researchers can observe the effects without any expectations from participants. 

Example of Single-Blind Study

Analyze the experimental setup described in the case study below. Identify the most significant potential source of bias that could compromise the study's results and explain why it is a concern.

Identifying Potential Bias in an Experimental Design

In a single-blind study, which of the following accurately describes the awareness of condition assignments?

Although a single-blind study controls for participant expectations, it is still vulnerable to experimenter expectancy effects because the researcher knows the group assignments.

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