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Explain the purpose of using the scientific method in psychological experiments. 

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The purpose of using the scientific method in psychological experiments is to be sure that the insights gained from those experiments will be as valid as possible.  The scientific method helps to accomplish this because it helps to make sure that research is done in a systematic way.

If the scientific method is not used, experiments are not really experiments.  Without the scientific method, they are no more than random actions or collections of anecdotes.  The scientific method helps to ensure that the experiments are carried out in such a way that their conclusions can be tested by others and, thereby, can be shown to be valid or invalid.

The point of psychological experiments is to find out things about human thought processes that are objectively true.  Using the scientific method allows researchers to be more certain that they have found the truth.  It does this in large part by creating experiments that can be replicated by other researchers and whose findings can be falsified.  If other researchers can copy an experiment, the experiment can be done multiple times to ensure that the results are consistent.  If the conclusions are falsifiable, they can be proven wrong.  This, too, allows researchers to determine what is objectively true.

The scientific method is a good way to be as sure as possible that researchers are finding facts that are objectively true.  Since this is the goal of psychological research, the scientific method is very important for experiments in that field.

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Psychology is the scientific study of behavior and mental processes. Whereas others before the advent of psychology have studied these two aspects of the human experience, what separates psychology from other disciplines, such as philosophy of mind, for example, is the use of and proper application of the scientific method. The scientific method is the foundation of not just psychology, but of all sciences. There are two general types of science: Social or behavioral sciences such as psychology, sociology, and anthropology, and natural or physical sciences such as biology, chemistry, and physics. The former study human behavior behavior in all its forms and dimensions, while the latter studies the natural world and/or physical reality. However differing the subject of study, what they both have in common is the central importance of the scientific method.

The scientific method is a five-(or six)part, step-by-step process that begins and ends with the creation of a theory (Steps 1 and 6). A scientific theory is an explanation of how some aspect of reality works, or in other words an establishment of a cause-effect relationship. In order to prove a theory or explanation has validity, or scientific value, one must participate in scientific research first. Research occurs when scientists find two separate, but equally important, ingredients: a representative sample of the population they wish to study (Step 2) and an experiment in which they can do a test, or tests, on that sample (Step 3). When scientists do an experiment they must find ways to isolate certain variables they believe are influencing behaviors. While doing this they must observe the results of the experiment by collecting and analyzing its data (Step 4). By doing this social scientists, or psychologists, are attempting to create some type of causal pattern that will explain some aspect of human behavior (external or internal).

After experimentation and observation are complete the scientist is obliged to publish his or her results for the rest of the scientific community so the experiment can be replicated (Step 5). Replication is a very important aspect of the scientific method because one needs to see if their theory can withstand the critical viewership of other scientists. Other scientists are encouraged to attempt to disprove the theory in question to see what errors may have occurred at any one of the five stages. It is extremely rare for a theory to get published into a scientific journal without some type of critique or revision from other scientists causing the experimenter to have to redo the experiment but this time with some type of modification. This is how psychologists, and all scientists, work within their chosen field of study.