In backroom negotiations, Democrats conceded the disputed election returns to Hayes in return for his agreement to withdraw the reamaining 3000 federal troops, thereby putting a formal end to Reconstruction and assuring Democratic control, based on a platform of white supremacy and black disenfranchisement, throughout
Answer:
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.
Robert Yerkes, who lived from May 26, 1876 to
February
3, 1956 <span> was an </span>American psychologist, pioneer
in the area of industrial psychology. He is also an ethologist, eugenicist and
primatologist. He is best
known in the field of comparative psychology and for his work in intelligence
testing.