Explanation and Hypothesis: The scientist tests the hypothesis using an experiment with controls. For instance, if you observe a plant wilt and die during a summer drought, a reasonable explanation is that water is necessary for plant success. Scientifically testing that explanation involves two hypotheses: a null hypothesis and an alternative.
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The assumption of a statistical test is called the null hypothesis, or hypothesis 0 (H0 for short). It is often called the default assumption, or the assumption that nothing has changed. A...
Scientists begin their research with a hypothesis that a relationship of some kind exists between variables. The null hypothesis is the opposite stating that no such relationship exists. Null hypothesis may seem unexciting, but it is a very important aspect of research.