experimenter bias (noun)

1. During the famous Stanford Prison Experiment in 1971, Dr. Philip Zimbardo's experimenter bias influenced the behavior of the participants and resulted in ethical concerns.

2. The experimenter bias in a fashion experiment can lead to participants being subtly influenced by the experimenter's preferences and expectations of style.

3. In literary studies, experimenter bias may affect the interpretation and analysis of a novel, as the experimenter's preconceived notions can influence their understanding of the text.

4. In a study analyzing the effects of violent cartoons on children, experimenter bias can inadvertently influence the observations and conclusions drawn from the experiment.