Statistics Dictionary

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Test Statistic

In hypothesis testing, the test statistic is a value computed from sample data. The test statistic is used to assess the strength of evidence in support of a null hypothesis.

Suppose the test statistic in a hypothesis test is equal to S. If the probability of observing a test statistic as extreme as S is less than the significance level, we reject the null hypothesis.

See also:   Tests of Significance | How to Test Hypotheses