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A Step-by-Step Approach to Using SAS® for Univariate & Multivariate Statistics, Second Edition by Edward J. Stepanksi Ph.d., Larry Hatcher, Norm O'Rourke

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The Paired-Samples t Test

Paired Samples versus Independent Samples

The paired-samples t test (sometimes referred to as the correlated-samples t test or matched-samples t test) is similar to the independent-samples test in that both procedures involve comparing two samples of observations, and determining whether or not the mean of one sample significantly differs from the mean of another. With the independent-samples procedure, the two groups of scores are completely independent (i.e., an observation in one sample is not related to any observation in the other). In experimental research, this is normally achieved by drawing a sample of participants and randomly assigning each to either a treatment or control condition. Because each participant ...

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