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Hypotheses are vital to planning a research project and are considered standard per the CONSORT statement (see below) related to the reporting of clinical trials. The following e-books have helpful information to help you articulate your hypothesis.
The CONSORT (Consolidated Standards of Reporting Trials) Group works to alleviate the issues of inadequately reported trials. Their primary output, the CONSORT Statement, provides guidance and standards for authors on how to report randomized controlled trials.