A scientist, conducting a research study on sleep and learning, questions her own objectivity and decides to let a third person, not associated with conducting the experiment, score the tests. The scientist is probably trying to eliminate .

experimenter bias

Explanation:

The scientist try to eliminate experimenter bias because in  experimenter bias experimenter influence the outcomes of participants by giving cues to obtained expected results. Such experiments are biased because  in this participants view and response controlled sub-consciously to meet the expected outcomes of experimenter.

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