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In scientific research, an experiment (Latin: ex- periri, "to try out") is a method of investigating causal relationships among variables, or to test a hypothesis. An experiment is a cornerstone of the empirical approach to acquiring data about the world and is used in both natural sciences and social sciences. An experiment can be used to help solve practical problems and to support or negate theoretical assumptions. == Controlled experiments == 
Main article: Experimental control An experiment or test can be carried out by using the scientific method. The steps are make an observation, ask a question, form a hypothesis, test the hypothesis, analyze the results, draw a conclusion, and communicate results. The reason a hypothesis is tested is so that it can be confirmed, denied, or refined, with the knowledge currently available. The test has one variable. The control is the re

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