The idea that the people agree to establish rulers for certain purposes, but they have the right to resist or remove rulers who violate those purposes?

The idea of Social Contract Theory

Explanation:

The Social Contract Theory was addressed by several philosophers, but the one who stated that people can resist and remove rulers who violate their purposes it was John Locke. Locke was against the idea that a ruler should have absolute power over decisions related to the well-being of the people. But he agreed that it was necessary to have an impartial power of judgment that was beyond the citizens. In general, however, the Social Contract Theory indicates a class of theories that try to explain the paths that lead people to form States and/or maintain the social order.

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.