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Alternative Hypothesis. The alternative hypothesis is the hypothesis used in hypothesis testing that is contrary to the null hypothesis. It is usually taken to be that the observations are the result of a real effect (with some amount of chance variation superposed). SEE ALSO: Hypothesis, Hypothesis Testing, Null Hypothesis.
Null hypothesis. Definition. noun. (1) An assumption or proposition where an observed difference between two samples of a statistical population is purely accidental and not due to systematic causes. (2) The hypothesis to be investigated through statistical hypothesis testing so that when refuted indicates that the alternative hypothesis is true. Supplement. A null hypothesis is a hypothesis that is valid or presumed true until invalidated by a statistical test. Thus, one cannot say that a null hypothesis is ââacceptedââ rather a null hypothesis ââcannot be rejectedââ as it remains to be true based on the statistical evidence supporting it.