Which term describes a situation where a researcher's expectations or preferences about the outcome of a study influence the results of the study

A)  subject bias
B)  the placebo effect 
C)  experimenter bias
D)  the sampling effect

Experimenter bias describes a situation where a researcher's expectations or preferences about the outcome of a study influence the results of the study. This can happen when the researcher unconsciously or deliberately influences the study's outcome through the way they design, conduct, or analyze the study. This can lead to a distorted interpretation of the data and compromise the validity of the study's conclusions. It is important for researchers to be aware of their own biases and take steps to minimize the risk of experimenter bias, such as using blinded or double-blind procedures.