If you are a participant in a study and you think you know how you are expected to behave, this is an example of expectations; whereas an experimenter smiling at you when you do what he or she expects is an example of expectations

Participant; experimenter                                                                                                                              

Explanation:

Participant expectations: The term participant expectations are defined as the tendency of a participant's ideas or thinking about a particular research and therefore the researcher or experimenter that results in affecting the data's trustworthiness. In research, participants often alter their behavior based on the design and nature of a particular study or research.

Experimenter expectations: the term experimenter expectations are defined as one of the factors related to the experimenter bias. It often occurs when the experimenter psychologist, experimenter, or researcher tends to anticipate a specific finding will make sure about the hypothesis.

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