Choosing Hypotheses

Stating the null and alternative hypotheses correctly is crucial to using data to answer health questions. But is there only one correct way to define the null and alternative hypotheses to address the health question you are studying? Why or why not?
reference 1: Gerstman, B.B. (2016). Basic biostatistics: statistics for public health practice. (2nd ed). Burlington, MA: Jones & Bartlett Learning

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