Statistics Dictionary

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A t-test is any hypothesis test in which the test statistic follows Student's t distribution if the null hypothesis is true. Some common t-tests are:

  • One-sample t-test. Used to determine whether a hypothesized population mean differs significantly from an observed sample mean. See one-sample t-test example.

  • Two-sample t-test. Used to determine whether the difference between samples means differs significantly from the hypothesized difference between population means. See two-sample t-test example.

  • Matched pairs t-test. Used to test the significance of the difference between paired means. See Matched pairs t-test example.

  • Linear regression t-test. Used in simple linear regression to determine whether the slope of regression line differs significantly from zero. See linear regression t-test example.
See also:   Student's t Distribution