ABSTRACT
The dependent-samples t test (also known as paired-samples t, repeated-measures t, or matched-subjects t) is used when the mean of one sample is compared to the mean of another sample, where the two samples are related in some way. With the dependent-samples t test, the two samples may consist of either the same people measured on two occasions or related people who are each measured once (e.g., identical twins on IQ, husbands and wives on quality of communication). The key to correctly identifying the dependent-samples t test is to remember that the two samples are naturally related in some way. An example of a dependent-samples t test is presented next.
