The introduction should identify the problem or issue and provide the background information (on previous work and/or theories) that the reader needs to understand your experiment. To do this, the introduction contains a brief literature review to describe previous research conducted on the problem, and to explain how the current experiment will help to clarify or expand the knowledge. The introduction should end with a purpose statement (sometimes in the form of a hypothesis or null hypothesis): one sentence which speciﬁcally states the question your experiment was designed to answer.
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