Psychologists conduct investigations and experiments in order to establish a correlation as to how nature and nurture affect a person's cognitive and behavioral capacity. This is a hard thing to capture, because it is not palpable and it is very inherent to the unique needs of each individual. Hence, the more experiments are conducted in one same aspect of psychology, the more evidence can be obtain to establish behavioral and cognitive patterns. This can help predict causative factors that may repeat themselves in other individuals.
The field of psychology is mostly a cognitive and behavioral field. This means that it deals with people's processes of behavior (and how they acquire it), and mental capacity (or lack thereof). What this means is that none of these two elements can be quantified the way numbers, quantities and concrete things are. Both knowledge and behavior are not as "black and white" because they are completely dependent on the individual's nature and nurture.
In the field you will encounter mainly four types of experiments: Experimental (large quantities of participants, randomly selected, quantitatively measured), quasi experimental, qualitative (mostly to detect changes in behaviors, likes, dislikes, trends, fads, etc) and quantitative (standardized, specific, random batteries given to individuals of similar and non-similar groups). You also get case studies, phenomenologies (events that happen over time, or at certain ocasions) and much more. All explore different facets of a person's development in society, and within their own immediate social support.
Having lots of results available allows this field move from the foundations of the philosophy of cognitive and behavioral sciences to the more concrete field of investigative psychology, research statistics, and psychological testing.
Psychologists employ three primary techniques for their research. The first is naturalistic observation, which involves watching the behavior of human beings and other animals in their natural environment. Next is systematic assessment which includes a variety of organized methods or techniques to examine and assess people's thoughts, feelings and personality traits. Finally, experimentation is used to confirm or discover cause and effect relationships in behavior.
The psychological experimentation are carried out under closely controlled and standardized condition. It usually involves studying specific aspects of behavior two matched set of subjects participating tin the experiment. One set There the characteristics of the people in two groups or the conditions they are subjected two differ only in respect of some specified variable under study during the experiment. The experimental method provides scientists with a firm base for quantifying their observations. This allows other to make a systematic analysis of the accuracy and reliability of the conclusions drawn.
maybe to know what to expect. i am just guessing.