A test on the mean of a normal variate when the variance is unknown.
In Praat, the t-test is used to query a Covariance object and:
You should use a t-test when you want to test a hypothesis about the mean of one column in a TableOfReal object, or, if you want to test a hypothesis about the difference between the means of two columns in this object.
You can perform these t-tests in Praat by first transforming the TableOfReal object into a Covariance object (see TableOfReal: To Covariance) and then choosing the appropriate query method on the latter object.
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