Final answer:
Blind measurement is a type of measurement that prevents bias on the part of the scientist performing the study. It involves conducting a blind experiment or study where the subjects do not know their group assignment. This helps control for experimenter bias and allows researchers to interpret responses without being influenced by this knowledge.
Step-by-step explanation:
Blind measurement is a type of measurement that prevents bias on the part of the scientist performing the study. In a blind experiment or study, the subjects do not know in which experimental group they have been placed, which helps avoid bias in the outcome. This is done to control for experimenter bias, the possibility that a researcher's expectations might skew the results. By keeping the subjects blind to their group assignment, the researchers are able to interpret their responses without being influenced by this knowledge.