Psychologists rely on the when conducting their research.

scientific method

Explanation:

Psychologists rely on the scientific method in order to conduct their research. This is because psychology is a type of science. However, since psychology deals with humans, not all aspects of the scientific method can be employed. Moreover, the ones that can be are applied in ways that differ from how these operate in the natural sciences.

its d i know cause i've been googling it

answer; the federal reserve system;