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An hypothesis is an educated guess about the answer to your question. You did educate yourself with all the research, right? Your experiment will either support or disprove your hypothesis.
Remember, your hypothesis need not be right – disproof is a result too! In fact, many of the greatest discoveries have come from the disproof of an hypothesis.
Generally your hypothesis should be stated clearly, with the lines of reasoning and supporting facts you used to generate it. It is very important that you generate some sort of hypothesis before you start your experiment proper – without some idea of what you are looking for, it is hard to design an experiment, and usually even harder to understand the results.