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Paired t-Test

The paired t-test is a t-test that is used when the test units can be paired. For example, the blood pressure of five patients was tested before and after a medication:

 Patient Before After D Andrew 120 110 10 Bill 135 115 20 Charles 110 110 0 David 140 135 5 Eric 115 110 5

A Two Sample t test would show no significant difference in the 'before' and 'after' results because the difference between individuals masks the 'before' and 'after' difference.

The paired test involves carrying out a One Sample t-test on the differences. Despite the variation between individuals the 'after' blood pressure is generally lower.

 Analytical and descriptive statistics are covered in the MiC Quality online course Primer in Statistics. Try out our courses by taking the first module of the Primer in Statistics free of charge.
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