In order to answer this question it is important to understand the definitions of both psychology and science. In order to prove this claim we have to look at whether or not psychology can fill this definition above. Scientific study is a valid way of coming to an understanding of life, and can be very useful in every area of life.
Science develops theories based on what is observed.
It examines each theory with rigorous and scrupulous tests to see if it describes reality. The scientific method works well in observing and recording physical data and in reaching conclusions which either confirm or nullify a theory. They believed that if people could be studied in a scientific manner, there would be a greater accuracy in understanding present behavior, in predicting future behavior, and, most controversially, in altering behavior through scientific intervention. Personality theorists study individual behavior. Comparative psychologists study animal behaviors across the range of species Physiological psychologists are concerned with the biological basis of behavior.