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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.
A scientific hypothesis is the initial building block in the scientific method. Many describe it as an educated guess, based on prior knowledge and observation. While this is true, the definition can be expanded.