One that is in charge of passage through the gate.
Answer: Experimenter bias
Explanation:
The experimental bias is the term which refers to the experimental science phenomena where the final outcome of the experiment are biased towards the expected result.
It is also refers as research bias and due to the subjective influence the researcher affects the data and also the result. The final results of the experiment are based towards the expect outcome in terms of human experimenter.
According to the given question, Miriam is studying the various types of effects about the basic genres of the music and in her group she makes sure that the people are not liking the classical music.
Therefore, Experimenter bias is the correct answer.
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