The t-test is a statistical hypothesis test in which the test statistic follows a Student's t-distribution under the null hypothesis. It is most commonly used to determine if there is a significant difference between the means of two groups, or if there is a significant difference between the mean of a group and a hypothesized value. Different types of t-tests exist for different situations, such as independent samples t-tests, paired samples t-tests, and one-sample t-tests.
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