Scientific Hypothesis, Theory, Law Definitions - ThoughtCo
For example, if we want to compare the test scores of two random of men and women, the null hypothesis would be that the mean score in the male population from which the first sample was drawn was the same as the mean score in the female population from which the second sample was drawn:where:
Teaching the Hypothesis – Mr. Dr. Science Teacher
However, it is not possible to come up with an example for each cell of these matrices because it is not possible to propose a non-directional and causal hypothesis.
Concerns regarding the high of to detect differences in large samples have led to suggestions for re-defining the null hypothesis, for example as a hypothesis that an effect falls within a range considered negligible.