## Alphabetical

# alternative hypothesis

*[noun] *

In statistical testing, an alternative hypothesis (H_{1}) is a statement describing the possibility that an observed result or effect is genuine. The alternative hypothesis is always compared to a null hypothesis (H_{0}), and H_{1} is not accepted until statistical testing shows that it should be accepted in favor of H_{0}. For example, in an evaluation of data regarding the pain relieving properties of a new drug, the alternative hypothesis would state that the new drug has an effect on pain relief compared to a control. Accepting H_{1} does not indicate that the observed result or effect is large or important, simply that it is favored in terms of probability of the outcome.

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