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:: Home ::Six Sigma ::SIX SIGMA GLOSSARY: Paired t-Test :: CURRENT STUDENTS LOGIN

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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.

See also Two Sample t-Test.

 

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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