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one-tailed test
one-tailed test A one-tailed test is a significance test that looks at the probability of a result as extreme as the observed one in only one specified direction, such as values greater than a hypothesized value.
A one-tailed test is a significance test that looks at the probability of a result as extreme as the observed one in only one specified direction, such as values greater than a hypothesized value. It is used when the question concerns change or difference in a single direction rather than either direction.