
A test on the mean of a normal variate when the variance is unknown.
In Praat, the ttest is used to query a Covariance object and:
You should use a ttest 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 ttests 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.
© djmw, January 17, 2002